diff --git a/_examples/cpkg/cpkg.go b/_examples/cpkg/cpkg.go
index 4c973f9..65b2c6b 100644
--- a/_examples/cpkg/cpkg.go
+++ b/_examples/cpkg/cpkg.go
@@ -8,7 +8,7 @@ package cpkg
 //#include <string.h>
 //#include <stdlib.h>
 //void cpkg_printf(const char *str) {
-//	fprintf(stdout, str);
+//	fprintf(stdout, "%s", str);
 //	fflush(stdout);
 //}
 import "C"