diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index d38113a31a..31ac30cf2f 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -2045,7 +2045,7 @@ static int ensure_core_worktree(int argc, const char **argv, const char *prefix)
 	struct repository subrepo;
 
 	if (argc != 2)
-		BUG("submodule--helper connect-gitdir-workingtree <name> <path>");
+		BUG("submodule--helper ensure-core-worktree <path>");
 
 	path = argv[1];