diff --git a/br/pkg/version/version_test.go b/br/pkg/version/version_test.go
index c086375b2118e..4d0130ea8be8d 100644
--- a/br/pkg/version/version_test.go
+++ b/br/pkg/version/version_test.go
@@ -280,6 +280,15 @@ func TestCheckClusterVersion(t *testing.T) {
 		require.True(t, variable.EnableConcurrentDDL.Load())
 	}
 
+	{
+		mock.getAllStores = func() []*metapb.Store {
+			return []*metapb.Store{{Version: "v6.2.0-alpha"}}
+		}
+		err := CheckClusterVersion(context.Background(), &mock, CheckVersionForDDL)
+		require.NoError(t, err)
+		require.True(t, variable.EnableConcurrentDDL.Load())
+	}
+
 	{
 		mock.getAllStores = func() []*metapb.Store {
 			return []*metapb.Store{{Version: "v6.1.0"}}