diff --git a/tests/unit/precomputed-shader-sky-environment-cache.test.ts b/tests/unit/precomputed-shader-sky-environment-cache.test.ts
index ab1d6e21..31691d94 100644
--- a/tests/unit/precomputed-shader-sky-environment-cache.test.ts
+++ b/tests/unit/precomputed-shader-sky-environment-cache.test.ts
@@ -39,7 +39,7 @@ describe("PrecomputedShaderSkyEnvironmentCache", () => {
     const world = createDefaultWorldSettings();
     const time = createDefaultProjectTimeSettings();
     const buildOrder: string[] = [];
-    const phaseTextures = {
+    const phaseTextures: Record<"day" | "dawn" | "dusk" | "night", Texture> = {
       day: new Texture(),
       dawn: new Texture(),
       dusk: new Texture(),