--- builtins/printf.def.orig	2012-12-03 14:14:04.000000000 +0100
+++ builtins/printf.def	2012-12-03 14:14:44.000000000 +0100
@@ -577,7 +577,7 @@
 #else
   if (string == 0 || len == 0)
 #endif
-    return;
+    return 0;
 
 #if 0
   s = fmt;