diff --git a/src/lib/queries/useQuery$.reactivity.test.tsx b/src/lib/queries/useQuery$.reactivity.test.tsx
index 192dd09..20af7b1 100644
--- a/src/lib/queries/useQuery$.reactivity.test.tsx
+++ b/src/lib/queries/useQuery$.reactivity.test.tsx
@@ -4,10 +4,10 @@ import { describe, expect, it } from "vitest"
 import {
   createQueryClient,
   createWrapper,
-  isDefined,
   liveQueryOptions,
 } from "../../tests/liveQuery"
 import { waitForTimeout } from "../../tests/utils"
+import { isDefined } from "../utils/isDefined"
 import { useQuery$ } from "./useQuery$"
 
 describe("useQuery$ live-query reactivity", () => {
diff --git a/src/lib/queries/useQuery$.unmount.test.tsx b/src/lib/queries/useQuery$.unmount.test.tsx
index e553718..d07d9ac 100644
--- a/src/lib/queries/useQuery$.unmount.test.tsx
+++ b/src/lib/queries/useQuery$.unmount.test.tsx
@@ -5,10 +5,10 @@ import { describe, expect, it } from "vitest"
 import {
   createQueryClient,
   createWrapper,
-  isDefined,
   liveQueryOptions,
 } from "../../tests/liveQuery"
 import { waitForTimeout } from "../../tests/utils"
+import { isDefined } from "../utils/isDefined"
 import { useQuery$ } from "./useQuery$"
 
 describe("useQuery$ unmount / remount", () => {
diff --git a/src/tests/liveQuery.tsx b/src/tests/liveQuery.tsx
index 51f5e54..5f1b27a 100644
--- a/src/tests/liveQuery.tsx
+++ b/src/tests/liveQuery.tsx
@@ -2,10 +2,6 @@ import { QueryClient, QueryClientProvider } from "@tanstack/react-query"
 import type React from "react"
 import { QueryClientProvider$ } from "../lib/queries/QueryClientProvider$"
 
-export function isDefined<T>(value: T | undefined | null): value is T {
-  return value != null
-}
-
 export function createQueryClient() {
   return new QueryClient({
     defaultOptions: {