--- openjdk/jdk/src/share/native/com/sun/java/util/jar/pack/utils.cpp
+++ openjdk/jdk/src/share/native/com/sun/java/util/jar/pack/utils.cpp
@@ -81,7 +81,7 @@
 int assert_failed(const char* p) {
   char message[1<<12];
   sprintf(message, "@assert failed: %s\n", p);
-  fprintf(stdout, 1+message);
+  fprintf(stdout, "%s", 1+message);
   breakpoint();
   unpack_abort(message);
   return 0;