diff --git a/builtin/credential-cache.c b/builtin/credential-cache.c
index 5de8b9123b..c51f7fc2ad 100644
--- a/builtin/credential-cache.c
+++ b/builtin/credential-cache.c
@@ -189,7 +189,8 @@ int cmd_credential_cache(int argc,
 
 #else
 
-int cmd_credential_cache(int argc, const char **argv, const char *prefix)
+int cmd_credential_cache(int argc, const char **argv, const char *prefix,
+			 struct repository *repo UNUSED)
 {
 	const char * const usage[] = {
 		"git credential-cache [options] <action>",