diff --git a/packages/store/test/legacy-runtime-removal.test.ts b/packages/store/test/legacy-runtime-removal.test.ts
index 80e9ebde..28b8cd6b 100644
--- a/packages/store/test/legacy-runtime-removal.test.ts
+++ b/packages/store/test/legacy-runtime-removal.test.ts
@@ -9,7 +9,11 @@ import { createStoreContainer, defineStore } from "../src/index.ts";
 // action once `store-codegen.ts` stopped emitting it) and has been removed.
 // This test locks in the remaining `options.runtime` -> `"shared"` chain so a
 // future edit can't silently drop the `"shared"` fallback too.
-const OnlySharedActionStore = defineStore({
+const OnlySharedActionStore = defineStore<
+  { count: number },
+  Record<string, never>,
+  { increment: (amount?: number) => void }
+>({
   name: "OnlySharedActionStore",
   kind: "global" as const,
   createSharedState: () => ({ count: 0 }),
@@ -17,12 +21,14 @@ const OnlySharedActionStore = defineStore({
     // No "client" or "server" definition exists for this action — only
     // "shared". A server-runtime container must still resolve it via the
     // "shared" fallback.
-    increment: {
-      runtime: "shared" as const,
-      handler: ({ state }: any, amount = 1) => {
-        state.count += amount;
+    increment: [
+      {
+        runtime: "shared" as const,
+        handler: ({ state }: any, amount = 1) => {
+          state.count += amount;
+        },
       },
-    },
+    ],
   },
 });