diff --git a/dialect/sql/schema/migrate.go b/dialect/sql/schema/migrate.go
index aa6d8c5809..97499323dd 100644
--- a/dialect/sql/schema/migrate.go
+++ b/dialect/sql/schema/migrate.go
@@ -187,7 +187,12 @@ func (m *Migrate) NamedDiff(ctx context.Context, name string, tables ...*Table)
 	opts := []migrate.PlannerOption{
 		migrate.WithFormatter(m.atlas.fmt),
 	}
-	if !m.atlas.genSum {
+	if m.atlas.genSum {
+		// Validate the migration directory before proceeding.
+		if err := migrate.Validate(m.atlas.dir); err != nil {
+			return err
+		}
+	} else {
 		opts = append(opts, migrate.DisableChecksum())
 	}
 	return migrate.NewPlanner(nil, m.atlas.dir, opts...).WritePlan(plan)
diff --git a/dialect/sql/schema/migrate_test.go b/dialect/sql/schema/migrate_test.go
index 59b2522f4e..2862069b7b 100644
--- a/dialect/sql/schema/migrate_test.go
+++ b/dialect/sql/schema/migrate_test.go
@@ -84,6 +84,19 @@ func TestMigrate_Diff(t *testing.T) {
 	requireFileEqual(t, filepath.Join(p, v+"_changes.up.sql"), "-- create \"users\" table\nCREATE TABLE `users` (, PRIMARY KEY ());\n")
 	requireFileEqual(t, filepath.Join(p, v+"_changes.down.sql"), "-- reverse: create \"users\" table\nDROP TABLE `users`;\n")
 	require.NoFileExists(t, filepath.Join(p, "atlas.sum"))
+
+	// Test integrity file.
+	p = t.TempDir()
+	d, err = migrate.NewLocalDir(p)
+	require.NoError(t, err)
+	m, err = NewMigrate(db, WithDir(d), WithSumFile())
+	require.NoError(t, err)
+	require.NoError(t, m.Diff(context.Background(), &Table{Name: "users"}))
+	requireFileEqual(t, filepath.Join(p, v+"_changes.up.sql"), "-- create \"users\" table\nCREATE TABLE `users` (, PRIMARY KEY ());\n")
+	requireFileEqual(t, filepath.Join(p, v+"_changes.down.sql"), "-- reverse: create \"users\" table\nDROP TABLE `users`;\n")
+	require.FileExists(t, filepath.Join(p, "atlas.sum"))
+	require.NoError(t, d.WriteFile("tmp.sql", nil))
+	require.ErrorIs(t, m.Diff(context.Background(), &Table{Name: "users"}), migrate.ErrChecksumMismatch)
 }
 
 func requireFileEqual(t *testing.T, name, contents string) {