diff --git a/Makefile.common b/Makefile.common
index 3c8cca72ac575..3224faed8578f 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -67,7 +67,7 @@ LDFLAGS += -X "github.com/pingcap/tidb/util/versioninfo.TiDBGitBranch=$(shell gi
 LDFLAGS += -X "github.com/pingcap/tidb/util/versioninfo.TiDBEdition=$(TIDB_EDITION)"
 
 EXTENSION_FLAG =
-ifeq ($(shell if [ -d extension/enterprise/.git ]; then echo "true"; fi),true)
+ifeq ($(shell if [ -f extension/enterprise/.git ]; then echo "true"; fi),true)
 	EXTENSION_FLAG += -X "github.com/pingcap/tidb/util/versioninfo.TiDBEnterpriseExtensionGitHash=$(shell cd extension/enterprise && git rev-parse HEAD)"
 endif