diff --git a/tsconfig.vitest.json b/tsconfig.vitest.json
index ff1d8c9..06dd490 100644
--- a/tsconfig.vitest.json
+++ b/tsconfig.vitest.json
@@ -2,8 +2,10 @@
   "extends": "./tsconfig.app.json",
 
   // Override to include only test files and clear exclusions.
-  // Application code imported in tests is automatically included via module resolution.
-  "include": ["src/**/__tests__/*", "env.d.ts"],
+  // .vue files must be explicitly included so vue-tsc enables .vue module
+  // resolution for this project (relying on transitive module resolution
+  // from test imports is unreliable in `vue-tsc --build`).
+  "include": ["src/**/__tests__/*", "env.d.ts", "src/**/*.vue"],
   "exclude": [],
 
   "compilerOptions": {