diff --git a/src/amps/frame.c b/src/amps/frame.c
index b70830c..d22dcd3 100644
--- a/src/amps/frame.c
+++ b/src/amps/frame.c
@@ -3343,7 +3343,7 @@ static void amps_encode_focc_bits(uint64_t word_a, uint64_t word_b, char *bits)
 {
 	int i, j, k;
 
-	strncpy(bits + 0, dotting, 10);
+	memcpy(bits + 0, dotting, 10);
 	bits[10] = 'i';
 	strcpy(bits + 11, sync_word);
 	bits[22] = 'i';
@@ -3391,10 +3391,10 @@ static void amps_encode_fvc_bits(uint64_t word_a, char *bits)
 	k = 0;
 	for (i = 0; i < 11; i++) {
 		if (i == 0) {
-			strncpy(bits + k, dotting, 101);
+			memcpy(bits + k, dotting, 101);
 			k += 101;
 		} else {
-			strncpy(bits + k, dotting, 37);
+			memcpy(bits + k, dotting, 37);
 			k += 37;
 		}
 		strcpy(bits + k, sync_word);
diff --git a/src/bnetz/bnetz.c b/src/bnetz/bnetz.c
index 9d326b8..1359d10 100644
--- a/src/bnetz/bnetz.c
+++ b/src/bnetz/bnetz.c
@@ -161,7 +161,7 @@ int bnetz_create(int kanal, const char *audiodev, int use_sdr, int samplerate, d
 {
 	bnetz_t *bnetz;
 	enum paging_signal paging_signal = PAGING_SIGNAL_NONE;
-	char paging_file[256] = "", paging_on[256] = "", paging_off[256] = "";
+	char paging_file[255] = "", paging_on[255] = "", paging_off[255] = "";
 	int rc;
 
 	if (!(kanal >= 1 && kanal <= 39) && !(kanal >= 50 && kanal <= 86)) {
diff --git a/src/cnetz/transaction.h b/src/cnetz/transaction.h
index ab1de61..dcbd6fe 100644
--- a/src/cnetz/transaction.h
+++ b/src/cnetz/transaction.h
@@ -40,7 +40,7 @@ typedef struct transaction {
 	uint8_t			futln_fuvst;
 	uint16_t		futln_rest;
 	int			extended;		/* extended frequency capability */
-	char			dialing[17];		/* number dialed by the phone */
+	char			dialing[18];		/* number dialed by the phone */
 	int64_t			state;			/* state of transaction */
 	int8_t			release_cause;		/* reason for release, (c-netz coding) */
 	int			try;			/* counts resending messages */
diff --git a/src/libdisplay/display_measurements.c b/src/libdisplay/display_measurements.c
index 7c963cd..76c6ac3 100644
--- a/src/libdisplay/display_measurements.c
+++ b/src/libdisplay/display_measurements.c
@@ -202,7 +202,7 @@ static void print_measurements(int on)
 				break;
 			}
 			/* "Deviation ::::::::::............   4.5 KHz" */
-			strncpy(line, param->name, (strlen(param->name) < MAX_NAME_LEN) ? strlen(param->name) : MAX_NAME_LEN);
+			memcpy(line, param->name, (strlen(param->name) < MAX_NAME_LEN) ? strlen(param->name) : MAX_NAME_LEN);
 			if (isinf(value) || isnan(value)) {
 				bar_left = -1;
 				bar_right = -1;
diff --git a/src/libdisplay/display_status.c b/src/libdisplay/display_status.c
index 671dd7f..9a38d36 100644
--- a/src/libdisplay/display_status.c
+++ b/src/libdisplay/display_status.c
@@ -83,7 +83,7 @@ void display_status_start(void)
 {
 	memset(screen, ' ', sizeof(screen));
 	memset(screen[0], '-', sizeof(screen[0]));
-	strncpy(screen[0] + 4, "Channel Status", 14);
+	memcpy(screen[0] + 4, "Channel Status", 14);
 	line_count = 1;
 }
 
@@ -103,7 +103,7 @@ void display_status_channel(int channel, const char *type, const char *state)
 	else
 		snprintf(line, sizeof(line), "Channel: %d State: %s", channel, state);
 	line[sizeof(line) - 1] = '\0';
-	strncpy(screen[line_count++], line, strlen(line));
+	memcpy(screen[line_count++], line, strlen(line));
 }
 
 void display_status_subscriber(const char *number, const char *state)
@@ -118,7 +118,7 @@ void display_status_subscriber(const char *number, const char *state)
 	else
 		snprintf(line, sizeof(line), "  Subscriber: %s", number);
 	line[sizeof(line) - 1] = '\0';
-	strncpy(screen[line_count++], line, strlen(line));
+	memcpy(screen[line_count++], line, strlen(line));
 }
 
 void display_status_end(void)
diff --git a/src/libsdr/sdr.c b/src/libsdr/sdr.c
index 0bcdf9a..e7221cf 100644
--- a/src/libsdr/sdr.c
+++ b/src/libsdr/sdr.c
@@ -562,7 +562,7 @@ int sdr_start(void *inst)
 			return rc;
 		}
 		pthread_getname_np(tid, tname, sizeof(tname));
-		strncat(tname, "-sdr_tx", sizeof(tname));
+		strncat(tname, "-sdr_tx", sizeof(tname) - 1);
 		tname[sizeof(tname) - 1] = '\0';
 		pthread_setname_np(tid, tname);
 		sdr->thread_read.running = 1;
@@ -574,7 +574,7 @@ int sdr_start(void *inst)
 			return rc;
 		}
 		pthread_getname_np(tid, tname, sizeof(tname));
-		strncat(tname, "-sdr_rx", sizeof(tname));
+		strncat(tname, "-sdr_rx", sizeof(tname) - 1);
 		tname[sizeof(tname) - 1] = '\0';
 		pthread_setname_np(tid, tname);
 	}