diff --git a/capture/capture_sync.c b/capture/capture_sync.c
index 7980399de5..50f5661403 100644
--- a/capture/capture_sync.c
+++ b/capture/capture_sync.c
@@ -419,7 +419,7 @@ sync_pipe_start(capture_options *capture_opts, GPtrArray *capture_comments,
         if (interface_opts->extcap_fifo != NULL)
         {
 #ifdef _WIN32
-            char *pipe = ws_strdup_printf("%s%" PRIuPTR, EXTCAP_PIPE_PREFIX, interface_opts->extcap_pipe_h);
+            char *pipe = ws_strdup_printf("%s%" PRIuMAX, EXTCAP_PIPE_PREFIX, (uintmax_t)interface_opts->extcap_pipe_h);
             argv = sync_pipe_add_arg(argv, &argc, pipe);
             g_free(pipe);
             i_handles++;
@@ -519,7 +519,7 @@ sync_pipe_start(capture_options *capture_opts, GPtrArray *capture_comments,
 #ifndef DEBUG_CHILD
     argv = sync_pipe_add_arg(argv, &argc, "-Z");
 #ifdef _WIN32
-    snprintf(control_id, ARGV_NUMBER_LEN, "%d", GetCurrentProcessId());
+    snprintf(control_id, ARGV_NUMBER_LEN, "%ld", GetCurrentProcessId());
     argv = sync_pipe_add_arg(argv, &argc, control_id);
 #else
     argv = sync_pipe_add_arg(argv, &argc, SIGNAL_PIPE_CTRL_ID_NONE);
@@ -2100,7 +2100,7 @@ static void create_dummy_signal_pipe() {
     if (dummy_signal_pipe != NULL) return;
 
     if (!dummy_control_id) {
-        dummy_control_id = ws_strdup_printf("%d.dummy", GetCurrentProcessId());
+        dummy_control_id = ws_strdup_printf("%ld.dummy", GetCurrentProcessId());
     }
 
     /* Create the signal pipe */
diff --git a/capture_opts.c b/capture_opts.c
index 498aaacfc0..40df74d7dc 100644
--- a/capture_opts.c
+++ b/capture_opts.c
@@ -194,7 +194,7 @@ capture_opts_log(const char *log_domain, enum ws_log_level log_level, capture_op
         ws_log(log_domain, log_level, "Promiscuous Mode[%02d]: %s", i, interface_opts->promisc_mode?"TRUE":"FALSE");
         ws_log(log_domain, log_level, "Extcap[%02d]          : %s", i, interface_opts->extcap ? interface_opts->extcap : "(unspecified)");
         ws_log(log_domain, log_level, "Extcap FIFO[%02d]     : %s", i, interface_opts->extcap_fifo ? interface_opts->extcap_fifo : "(unspecified)");
-        ws_log(log_domain, log_level, "Extcap PID[%02d]      : %d", i, interface_opts->extcap_pid);
+        ws_log(log_domain, log_level, "Extcap PID[%02d]      : %"PRIdMAX, i, (intmax_t)interface_opts->extcap_pid);
 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
         ws_log(log_domain, log_level, "Buffer size[%02d]     : %d (MB)", i, interface_opts->buffer_size);
 #endif
diff --git a/epan/dissectors/packet-protobuf.c b/epan/dissectors/packet-protobuf.c
index 3aef28dcc5..0ccbfd6ccf 100644
--- a/epan/dissectors/packet-protobuf.c
+++ b/epan/dissectors/packet-protobuf.c
@@ -506,13 +506,13 @@ abs_time_to_rfc3339(wmem_allocator_t *scope, const nstime_t *nstime, bool use_ut
     if (use_utc) {
         tm = gmtime(&nstime->secs);
         if (tm != NULL)
-            strftime(datetime_format, sizeof(datetime_format), "%FT%T%%sZ", tm);
+            strftime(datetime_format, sizeof(datetime_format), "%Y-%m-%dT%H:%M:%S%%sZ", tm);
         else
             snprintf(datetime_format, sizeof(datetime_format), "Not representable");
     } else {
         tm = localtime(&nstime->secs);
         if (tm != NULL)
-            strftime(datetime_format, sizeof(datetime_format), "%FT%T%%s%z", tm);
+            strftime(datetime_format, sizeof(datetime_format), "%Y-%m-%dT%H:%M:%S%%s%z", tm);
         else
             snprintf(datetime_format, sizeof(datetime_format), "Not representable");
     }
diff --git a/epan/dissectors/packet-snort.c b/epan/dissectors/packet-snort.c
index e3c753d206..8d6d42a03a 100644
--- a/epan/dissectors/packet-snort.c
+++ b/epan/dissectors/packet-snort.c
@@ -417,7 +417,7 @@ static void snort_reaper(GPid pid, gint status _U_, gpointer data)
         session->working = session->running = FALSE;
         /* XXX, cleanup */
     } else {
-        g_print("Errrrmm snort_reaper() %d != %d\n", session->pid, pid);
+        g_print("Errrrmm snort_reaper() %"PRIdMAX" != %"PRIdMAX"\n", (intmax_t)session->pid, (intmax_t)pid);
     }
 
     /* Close the snort pid (may only make a difference on Windows?) */
diff --git a/extcap.c b/extcap.c
index f27337e2bd..db909b34a8 100644
--- a/extcap.c
+++ b/extcap.c
@@ -1255,8 +1255,8 @@ void extcap_request_stop(capture_session *cap_session)
             continue;
         }
 
-        ws_debug("Extcap [%s] - Requesting stop PID: %d", interface_opts->name,
-              interface_opts->extcap_pid);
+        ws_debug("Extcap [%s] - Requesting stop PID: %"PRIdMAX, interface_opts->name,
+              (intmax_t)interface_opts->extcap_pid);
 
 #ifndef _WIN32
         if (interface_opts->extcap_pid != WS_INVALID_PID)
@@ -1499,8 +1499,8 @@ static void extcap_child_watch_cb(GPid pid, gint status _U_, gpointer user_data)
         interface_opts = &g_array_index(capture_opts->ifaces, interface_options, i);
         if (interface_opts->extcap_pid == pid)
         {
-            ws_debug("Extcap [%s] - Closing spawned PID: %d", interface_opts->name,
-                     interface_opts->extcap_pid);
+            ws_debug("Extcap [%s] - Closing spawned PID: %"PRIdMAX, interface_opts->name,
+                     (intmax_t)interface_opts->extcap_pid);
             interface_opts->extcap_pid = WS_INVALID_PID;
             extcap_watch_removed(cap_session, interface_opts);
             break;
@@ -1648,13 +1648,13 @@ static gboolean extcap_create_pipe(const gchar *ifname, gchar **fifo, HANDLE *ha
 
     if (*handle_out == INVALID_HANDLE_VALUE)
     {
-        ws_debug("Error creating pipe => (%d)", GetLastError());
+        ws_debug("Error creating pipe => (%ld)", GetLastError());
         g_free (pipename);
         return FALSE;
     }
     else
     {
-        ws_debug("Wireshark Created pipe =>(%s) handle (%" PRIuPTR ")", pipename, *handle_out);
+        ws_debug("Wireshark Created pipe =>(%s) handle (%" PRIuMAX ")", pipename, (uintmax_t)*handle_out);
         *fifo = g_strdup(pipename);
     }
 
diff --git a/wsutil/filesystem.c b/wsutil/filesystem.c
index c80f92070b..6e5ba34889 100644
--- a/wsutil/filesystem.c
+++ b/wsutil/filesystem.c
@@ -624,7 +624,7 @@ configuration_init_w32(const char* arg0 _U_)
             /*
              * Gak.  We can't format the message.
              */
-            return ws_strdup_printf("GetModuleFileName failed: %u (FormatMessage failed: %u)",
+            return ws_strdup_printf("GetModuleFileName failed: %lu (FormatMessage failed: %lu)",
                 error, GetLastError());
         }
         msg = utf_16to8(msg_w);
@@ -638,7 +638,7 @@ configuration_init_w32(const char* arg0 _U_)
             msg[msglen - 1] = '\0';
             msg[msglen - 2] = '\0';
         }
-        return ws_strdup_printf("GetModuleFileName failed: %s (%u)",
+        return ws_strdup_printf("GetModuleFileName failed: %s (%lu)",
             msg, error);
     }
 
diff --git a/wsutil/win32-utils.c b/wsutil/win32-utils.c
index fe49001c4f..97f586768c 100644
--- a/wsutil/win32-utils.c
+++ b/wsutil/win32-utils.c
@@ -183,7 +183,7 @@ win32strexception(DWORD exception)
         if (exceptions[i].code == exception)
             return exceptions[i].msg;
     }
-    snprintf(errbuf, (gulong)sizeof errbuf, "Exception 0x%08x", exception);
+    snprintf(errbuf, (gulong)sizeof errbuf, "Exception 0x%08lx", exception);
     return errbuf;
 }
 
diff --git a/wsutil/ws_pipe.c b/wsutil/ws_pipe.c
index da3b3a274b..af81f9de80 100644
--- a/wsutil/ws_pipe.c
+++ b/wsutil/ws_pipe.c
@@ -125,7 +125,7 @@ ws_pipe_create_overlapped_read(HANDLE *read_pipe_handle, HANDLE *write_pipe_hand
                                SECURITY_ATTRIBUTES *sa, DWORD suggested_buffer_size)
 {
     HANDLE read_pipe, write_pipe;
-    guchar *name = ws_strdup_printf("\\\\.\\Pipe\\WiresharkWsPipe.%08x.%08x",
+    guchar *name = ws_strdup_printf("\\\\.\\Pipe\\WiresharkWsPipe.%08lx.%08lx",
                                    GetCurrentProcessId(),
                                    InterlockedIncrement(&pipe_serial_number));
     gunichar2 *wname = g_utf8_to_utf16(name, -1, NULL, NULL, NULL);
@@ -336,7 +336,7 @@ gboolean ws_pipe_spawn_sync(const gchar *working_directory, const gchar *command
         {
             if (GetLastError() != ERROR_IO_PENDING)
             {
-                ws_debug("ReadFile on child stdout pipe failed. Error %d", GetLastError());
+                ws_debug("ReadFile on child stdout pipe failed. Error %ld", GetLastError());
                 pending_stdout = FALSE;
             }
         }
@@ -345,7 +345,7 @@ gboolean ws_pipe_spawn_sync(const gchar *working_directory, const gchar *command
         {
             if (GetLastError() != ERROR_IO_PENDING)
             {
-                ws_debug("ReadFile on child stderr pipe failed. Error %d", GetLastError());
+                ws_debug("ReadFile on child stderr pipe failed. Error %ld", GetLastError());
                 pending_stderr = FALSE;
             }
         }
@@ -396,7 +396,7 @@ gboolean ws_pipe_spawn_sync(const gchar *working_directory, const gchar *command
                             pending_stdout = FALSE;
                             continue;
                         }
-                        ws_debug("GetOverlappedResult on stdout failed. Error %d", GetLastError());
+                        ws_debug("GetOverlappedResult on stdout failed. Error %ld", GetLastError());
                     }
                     if (process_finished && (bytes_read == 0))
                     {
@@ -409,7 +409,7 @@ gboolean ws_pipe_spawn_sync(const gchar *working_directory, const gchar *command
                     {
                         if (GetLastError() != ERROR_IO_PENDING)
                         {
-                            ws_debug("ReadFile on child stdout pipe failed. Error %d", GetLastError());
+                            ws_debug("ReadFile on child stdout pipe failed. Error %ld", GetLastError());
                             pending_stdout = FALSE;
                         }
                     }
@@ -425,7 +425,7 @@ gboolean ws_pipe_spawn_sync(const gchar *working_directory, const gchar *command
                             pending_stderr = FALSE;
                             continue;
                         }
-                        ws_debug("GetOverlappedResult on stderr failed. Error %d", GetLastError());
+                        ws_debug("GetOverlappedResult on stderr failed. Error %ld", GetLastError());
                     }
                     if (process_finished && (bytes_read == 0))
                     {
@@ -436,7 +436,7 @@ gboolean ws_pipe_spawn_sync(const gchar *working_directory, const gchar *command
                     {
                         if (GetLastError() != ERROR_IO_PENDING)
                         {
-                            ws_debug("ReadFile on child stderr pipe failed. Error %d", GetLastError());
+                            ws_debug("ReadFile on child stderr pipe failed. Error %ld", GetLastError());
                             pending_stderr = FALSE;
                         }
                     }
@@ -444,7 +444,7 @@ gboolean ws_pipe_spawn_sync(const gchar *working_directory, const gchar *command
             }
             else
             {
-                ws_debug("WaitForMultipleObjects returned 0x%08X. Error %d", dw, GetLastError());
+                ws_debug("WaitForMultipleObjects returned 0x%08lX. Error %ld", dw, GetLastError());
             }
         }
 
@@ -721,7 +721,7 @@ ws_pipe_wait_for_pipe(HANDLE * pipe_handles, int num_pipe_handles, HANDLE pid)
                 break;
 
             default:
-                ws_debug("ConnectNamedPipe failed with %d\n.", error);
+                ws_debug("ConnectNamedPipe failed with %ld\n.", error);
                 result = FALSE;
             }
         }
@@ -776,7 +776,7 @@ ws_pipe_wait_for_pipe(HANDLE * pipe_handles, int num_pipe_handles, HANDLE pid)
                         TRUE);                     // wait
                     if (!success)
                     {
-                        ws_debug("Error %d \n.", GetLastError());
+                        ws_debug("Error %ld \n.", GetLastError());
                         result = FALSE;
                     }
                     pipeinsts[i].pendingIO = FALSE;
@@ -785,7 +785,7 @@ ws_pipe_wait_for_pipe(HANDLE * pipe_handles, int num_pipe_handles, HANDLE pid)
         }
         else
         {
-            ws_debug("WaitForMultipleObjects returned 0x%08X. Error %d", dw, GetLastError());
+            ws_debug("WaitForMultipleObjects returned 0x%08lX. Error %ld", dw, GetLastError());
             result = FALSE;
         }
     }