diff --git a/integration-tests/lts/dbschema/default.esdl b/integration-tests/lts/dbschema/default.esdl
index 7d2f031ee..d43931aa0 100644
--- a/integration-tests/lts/dbschema/default.esdl
+++ b/integration-tests/lts/dbschema/default.esdl
@@ -149,7 +149,7 @@ module default {
     property c -> bool;
   }
   type Z {
-    link xy -> W | X | Y;
+    multi link xy -> W | X | Y;
   }
 
   # Unicode handling
diff --git a/integration-tests/lts/interfaces.test.ts b/integration-tests/lts/interfaces.test.ts
index 4894671f0..e0a74f6f3 100644
--- a/integration-tests/lts/interfaces.test.ts
+++ b/integration-tests/lts/interfaces.test.ts
@@ -43,7 +43,7 @@ export interface test_Profile extends BaseObject {
   c?: string | null;
 }
 interface test_Z extends BaseObject {
-  xy?: W | X | Y | null;
+  xy?: (W | X | Y)[];
 }
 interface test_User extends BaseObject {
   username: string;
diff --git a/packages/generate/src/edgeql-js/generateInterfaces.ts b/packages/generate/src/edgeql-js/generateInterfaces.ts
index 6fe793d0b..d42c0f740 100644
--- a/packages/generate/src/edgeql-js/generateInterfaces.ts
+++ b/packages/generate/src/edgeql-js/generateInterfaces.ts
@@ -121,10 +121,10 @@ export const generateInterfaces = (params: GenerateInterfacesParams) => {
         Boolean(targetType.union_of?.length);
 
       if (isUnion) {
-        return targetType.union_of
+        return `(${targetType.union_of
           .map(({ id }) => types.get(id))
           .map((member) => getTypeName(member.name))
-          .join(" | ");
+          .join(" | ")})`;
       } else if (isLink) {
         return getTypeName(targetType.name);
       } else {