diff --git a/define.go b/define.go
index c9622db..6c67382 100644
--- a/define.go
+++ b/define.go
@@ -128,7 +128,7 @@ const CL_INIT_DEFAULT C.uint = C.CL_INIT_DEFAULT
 
 // Wraps the corresponding error message
 func Strerr(code ErrorCode) error {
-	err := errors.New(fmt.Sprintf("Error %s", C.int(code)))
+	err := errors.New(fmt.Sprintf("Error %d", C.int(code)))
 	return err
 }