diff --git a/cdc/entry/mounter.go b/cdc/entry/mounter.go
index c663a05c7b3..c11b9c081f4 100644
--- a/cdc/entry/mounter.go
+++ b/cdc/entry/mounter.go
@@ -756,6 +756,7 @@ func getDefaultOrZeroValue(col *timodel.ColumnInfo) (types.Datum, any, int, stri
 	return d, v, size, warn, err
 }
 
+// GetDDLDefaultDefinition returns the default definition of a column.
 func GetDDLDefaultDefinition(col *timodel.ColumnInfo) interface{} {
 	defaultValue := col.GetDefaultValue()
 	if defaultValue == nil {
diff --git a/cdc/entry/mounter_test.go b/cdc/entry/mounter_test.go
index e2cf6c4308a..dc9c019a6e1 100644
--- a/cdc/entry/mounter_test.go
+++ b/cdc/entry/mounter_test.go
@@ -1003,7 +1003,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 	for _, tc := range testCases {
 		_, val, _, _, _ := getDefaultOrZeroValue(&tc.ColInfo)
 		require.Equal(t, tc.Res, val, tc.Name)
-		val = getDDLDefaultDefinition(&tc.ColInfo)
+		val = GetDDLDefaultDefinition(&tc.ColInfo)
 		require.Equal(t, tc.Default, val, tc.Name)
 	}
 }