diff --git a/tsconfig.common.json b/tsconfig.common.json
index 886ae832..eda60050 100644
--- a/tsconfig.common.json
+++ b/tsconfig.common.json
@@ -16,9 +16,4 @@
   "include": [
     "src/common/**/*",
   ],
-  // tests are run by vitest from the sources; don't emit them into the build output,
-  // or vitest would discover and run the compiled copies too
-  "exclude": [
-    "src/common/**/*.test.ts",
-  ],
 }
\ No newline at end of file
diff --git a/tsconfig.node.json b/tsconfig.node.json
index 4b807e3f..31f8154c 100644
--- a/tsconfig.node.json
+++ b/tsconfig.node.json
@@ -11,6 +11,7 @@
   },
   "include": [
     "electron.vite.config.ts",
+    "vitest.config.ts",
     "i18next.config*.ts",
     "script/**/*",
   ],
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 00000000..b624cd45
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,9 @@
+import { configDefaults, defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    // `tsc --build` compiles src/common (tests included) into common-ts-dist. Don't discover those
+    // compiled copies, or every test in src/common would also run a second time from the build output.
+    exclude: [...configDefaults.exclude, 'common-ts-dist/**'],
+  },
+});