diff --git a/src/mod/endpoints/mod_iax/iax2-parser.c b/src/mod/endpoints/mod_iax/iax2-parser.c
index ab3331e9ea..6c0e88c141 100644
--- a/src/mod/endpoints/mod_iax/iax2-parser.c
+++ b/src/mod/endpoints/mod_iax/iax2-parser.c
@@ -56,7 +56,7 @@ static unsigned short get_uint16(unsigned char *p)
 
 static void internaloutput(const char *str)
 {
-	printf(str);
+	printf("%s", str);
 }
 
 static void internalerror(const char *str)