diff --git a/sched/validate_util.h b/sched/validate_util.h
index 816a351dd7..6a00cf39ff 100644
--- a/sched/validate_util.h
+++ b/sched/validate_util.h
@@ -51,6 +51,7 @@ extern bool standalone;
     // if set, look for output files in the current directory,
     // not the upload hierarchy.
     // used by validator_test.
+extern void remove_random_from_filename(const char* in, char* out);
+
 #endif
 
-extern void remove_random_from_filename(const char* in, char* out);