diff -urN echat-0.04beta1/chat_parm.c echat-0.04beta1.new/chat_parm.c
--- echat-0.04beta1/chat_parm.c	2003-08-20 07:04:17.000000000 +0200
+++ echat-0.04beta1.new/chat_parm.c	2013-01-30 12:24:39.341755575 +0100
@@ -57,7 +57,7 @@
     strncat(message, "-DSHELL ", STR_SIZE);
 #endif  /* SHELL */
     strncat(message, "\n", STR_SIZE);
-    fprintf(stdout, message);
+    fprintf(stdout, "%s", message);
 }
 
 void parm_getopt(int argc, char *argv[]) {