--- a/sslh-main.c
+++ b/sslh-main.c
@@ -167,7 +167,7 @@ void cmd_ssl_to_tls(int argc, char* argv[])
             strcpy(argv[i], "--tls");
             /* foreground option not parsed yet, syslog not open, just print on
              * stderr and hope for the best */
-            fprintf(stderr, ssl_err_msg);
+            fprintf(stderr, "%s",  ssl_err_msg);
         }
     }
 }
