diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index d8b0b38dd8..ed87ad9947 100755
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -534,12 +534,12 @@ AST_MUTEX_DEFINE_STATIC(dpcache_lock);
 static void iax_debug_output(const char *data)
 {
 	if (iaxdebug)
-		ast_verbose(data);
+		ast_verbose("%s", data);
 }
 
 static void iax_error_output(const char *data)
 {
-	ast_log(LOG_WARNING, data);
+	ast_log(LOG_WARNING, "%s", data);
 }
 
 /* XXX We probably should use a mutex when working with this XXX */
diff --git a/channels/chan_zap.c b/channels/chan_zap.c
index c71e8878d2..9f510981e9 100755
--- a/channels/chan_zap.c
+++ b/channels/chan_zap.c
@@ -7125,7 +7125,7 @@ static void *do_idle_thread(void *vchan)
 
 static void zt_pri_message(char *s)
 {
-	ast_verbose(s);
+	ast_verbose("%s", s);
 }
 
 static void zt_pri_error(char *s)
diff --git a/channels/iax2-parser.c b/channels/iax2-parser.c
index 81d92a1759..5a0e2421e7 100755
--- a/channels/iax2-parser.c
+++ b/channels/iax2-parser.c
@@ -32,7 +32,7 @@ static int oframes = 0;
 
 static void internaloutput(const char *str)
 {
-	printf(str);
+	fputs(str, stdout);
 }
 
 static void internalerror(const char *str)
diff --git a/pbx/pbx_dundi.c b/pbx/pbx_dundi.c
index 407d969533..a7d2644b20 100755
--- a/pbx/pbx_dundi.c
+++ b/pbx/pbx_dundi.c
@@ -249,12 +249,12 @@ static int dundi_xmit(struct dundi_packet *pack);
 static void dundi_debug_output(const char *data)
 {
 	if (dundidebug)
-		ast_verbose(data);
+		ast_verbose("%s", data);
 }
 
 static void dundi_error_output(const char *data)
 {
-	ast_log(LOG_WARNING, data);
+	ast_log(LOG_WARNING, "%s", data);
 }
 
 static int has_permission(struct permission *ps, char *cont)