diff --git a/pkg/ddl/ddl_api.go b/pkg/ddl/ddl_api.go
index 14e048c86c38b..0419493c22231 100644
--- a/pkg/ddl/ddl_api.go
+++ b/pkg/ddl/ddl_api.go
@@ -6035,8 +6035,8 @@ func (d *ddl) AlterColumn(ctx sessionctx.Context, ident ast.Ident, spec *ast.Alt
 
 	// Clean the NoDefaultValueFlag value.
 	col.DelFlag(mysql.NoDefaultValueFlag)
+	col.DefaultIsExpr = false
 	if len(specNewColumn.Options) == 0 {
-		col.DefaultIsExpr = false
 		err = col.SetDefaultValue(nil)
 		if err != nil {
 			return errors.Trace(err)
diff --git a/tests/integrationtest/r/ddl/db_integration.result b/tests/integrationtest/r/ddl/db_integration.result
index 749c17f08b142..817080ce8e2af 100644
--- a/tests/integrationtest/r/ddl/db_integration.result
+++ b/tests/integrationtest/r/ddl/db_integration.result
@@ -409,6 +409,13 @@ t	CREATE TABLE `t` (
   `c` int(10) DEFAULT NULL,
   `c1` varchar(256) DEFAULT (uuid())
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
+drop table if exists t;
+create table t (c int(10), c1 varchar(256) default rand());
+alter table t alter column c1 set default 'xx';
+insert into t values (1, default);
+select c1 from t;
+c1
+xx
 drop table if exists t1;
 create table t1 (a int(11) not null auto_increment key, b int(11), c bigint, unique key (a, b, c));
 alter table t1 drop index a;
diff --git a/tests/integrationtest/t/ddl/db_integration.test b/tests/integrationtest/t/ddl/db_integration.test
index 8b5c170681b05..8bd6fe02f9fba 100644
--- a/tests/integrationtest/t/ddl/db_integration.test
+++ b/tests/integrationtest/t/ddl/db_integration.test
@@ -420,6 +420,13 @@ insert into t(c) values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
 select count(distinct c1) from t;
 show create table t;
 
+# TestDefaultValueExpressionWithModifyColumn
+drop table if exists t;
+create table t (c int(10), c1 varchar(256) default rand());
+alter table t alter column c1 set default 'xx';
+insert into t values (1, default);
+select c1 from t;
+
 # TestDropAutoIncrementIndex
 drop table if exists t1;
 create table t1 (a int(11) not null auto_increment key, b int(11), c bigint, unique key (a, b, c));