diff --git a/debian/libwsutil0.symbols b/debian/libwsutil0.symbols
index 3b78598c57..951712dcce 100644
--- a/debian/libwsutil0.symbols
+++ b/debian/libwsutil0.symbols
@@ -382,7 +382,7 @@ libwsutil.so.0 libwsutil0 #MINVER#
  ws_log_add_custom_file@Base 3.5.0
  ws_log_buffer_full@Base 3.5.1
  ws_log_console_writer@Base 3.7.0
- ws_log_console_writer_set_use_stderr@Base 3.7.0
+ ws_log_console_writer_set_use_stdout@Base 3.7.0
  ws_log_file_writer@Base 3.7.0
  ws_log_full@Base 3.5.0
  ws_log_get_level@Base 3.5.0
diff --git a/extcap/extcap-base.c b/extcap/extcap-base.c
index c4111405c2..c44981eed2 100644
--- a/extcap/extcap-base.c
+++ b/extcap/extcap-base.c
@@ -112,6 +112,8 @@ void extcap_base_set_running_with(extcap_parameters * extcap, const char *fmt, .
 void extcap_log_init(const char *progname)
 {
     ws_log_init(progname, NULL);
+    /* extcaps cannot write debug information to parent on stderr. */
+    ws_log_console_writer_set_use_stdout(TRUE);
 }
 
 uint8_t extcap_base_parse_options(extcap_parameters * extcap, int result, char * optargument)
diff --git a/ui/qt/main.cpp b/ui/qt/main.cpp
index edfb715914..f145f839a6 100644
--- a/ui/qt/main.cpp
+++ b/ui/qt/main.cpp
@@ -520,6 +520,8 @@ int main(int argc, char *qt_argv[])
 
     /* Initialize log handler early so we can have proper logging during startup. */
     ws_log_init_with_writer("wireshark", console_log_writer, vcmdarg_err);
+    /* For backward compatibility with GLib logging and Wireshark 3.4. */
+    ws_log_console_writer_set_use_stdout(TRUE);
 
     qInstallMessageHandler(qt_log_message_handler);
 
diff --git a/wsutil/wslog.c b/wsutil/wslog.c
index 47d6227d7d..9f53ce519c 100644
--- a/wsutil/wslog.c
+++ b/wsutil/wslog.c
@@ -84,8 +84,9 @@ static gboolean stdout_color_enabled = FALSE;
 
 static gboolean stderr_color_enabled = FALSE;
 
-/* Use stderr for levels "info" and below. */
-static gboolean stderr_debug_enabled = FALSE;
+/* Use stdout for levels "info" and below, for backward compatibility
+ * with GLib. */
+static gboolean stdout_logging_enabled = FALSE;
 
 static const char *registered_progname = DEFAULT_PROGNAME;
 
@@ -929,7 +930,7 @@ static inline struct tm *get_localtime(time_t unix_time, struct tm **cookie)
 
 static inline FILE *console_file(enum ws_log_level level)
 {
-    if (level <= LOG_LEVEL_INFO && !stderr_debug_enabled)
+    if (level <= LOG_LEVEL_INFO && stdout_logging_enabled)
         return stdout;
     return stderr;
 }
@@ -937,7 +938,7 @@ static inline FILE *console_file(enum ws_log_level level)
 
 static inline bool console_color_enabled(enum ws_log_level level)
 {
-    if (level <= LOG_LEVEL_INFO && !stderr_debug_enabled)
+    if (level <= LOG_LEVEL_INFO && stdout_logging_enabled)
         return stdout_color_enabled;
     return stderr_color_enabled;
 }
@@ -1098,9 +1099,9 @@ void ws_log_console_writer(const char *domain, enum ws_log_level level,
 
 
 WS_DLL_PUBLIC
-void ws_log_console_writer_set_use_stderr(bool use_stderr)
+void ws_log_console_writer_set_use_stdout(bool use_stdout)
 {
-    stderr_debug_enabled = use_stderr;
+    stdout_logging_enabled = use_stdout;
 }
 
 
diff --git a/wsutil/wslog.h b/wsutil/wslog.h
index 437f12e163..943f2b017a 100644
--- a/wsutil/wslog.h
+++ b/wsutil/wslog.h
@@ -68,14 +68,14 @@ void ws_log_console_writer(const char *domain, enum ws_log_level level,
                             const char *user_format, va_list user_ap);
 
 
-/** Configure all log output to use stderr.
+/** Configure log levels "info" and below to use stdout.
  *
- * Normally log levels "info", "debug" and "noisy" are written to stdout.
- * Calling this function with true configures these levels to be written
- * to stderr as well.
+ * Normally all log messages are written to stderr. For backward compatibility
+ * with GLib calling this function with TRUE configures log levels "info",
+ * "debug" and "noisy" to be written to stdout.
  */
 WS_DLL_PUBLIC
-void ws_log_console_writer_set_use_stderr(bool use_stderr);
+void ws_log_console_writer_set_use_stdout(bool use_stdout);
 
 
 /** Convert a numerical level to its string representation. */