diff --git a/pkg/sql/parser/parse_test.go b/pkg/sql/parser/parse_test.go
index b960343115a2..5673f80f885f 100644
--- a/pkg/sql/parser/parse_test.go
+++ b/pkg/sql/parser/parse_test.go
@@ -2533,7 +2533,7 @@ func TestUnimplementedSyntax(t *testing.T) {
 		issue    int
 		expected string
 	}{
-		{`ALTER TABLE a ALTER CONSTRAINT foo`, 0, `alter constraint`},
+		{`ALTER TABLE a ALTER CONSTRAINT foo`, 31632, `alter constraint`},
 		{`ALTER TABLE a ALTER b SET NOT NULL`, 28751, ``},
 		{`ALTER TABLE a RENAME CONSTRAINT b TO c`, 0, `alter table rename constraint`},
 
diff --git a/pkg/sql/parser/sql.y b/pkg/sql/parser/sql.y
index df251027b45d..fd812e005a48 100644
--- a/pkg/sql/parser/sql.y
+++ b/pkg/sql/parser/sql.y
@@ -1487,7 +1487,7 @@ alter_table_cmd:
     }
   }
   // ALTER TABLE <name> ALTER CONSTRAINT ...
-| ALTER CONSTRAINT constraint_name error { return unimplemented(sqllex, "alter constraint") }
+| ALTER CONSTRAINT constraint_name error { return unimplementedWithIssueDetail(sqllex, 31632, "alter constraint") }
   // ALTER TABLE <name> VALIDATE CONSTRAINT ...
 | VALIDATE CONSTRAINT constraint_name
   {