diff --git a/packages/test-utils/src/test-rig.ts b/packages/test-utils/src/test-rig.ts
index b1261ba4d9..39bb87b344 100644
--- a/packages/test-utils/src/test-rig.ts
+++ b/packages/test-utils/src/test-rig.ts
@@ -729,6 +729,7 @@ export class TestRig {
       cwd: this.testDir!,
       stdio: 'pipe',
       env: this._getCleanEnv(options.env),
+      shell: os.platform() === 'win32',
     });
     this._spawnedProcesses.push(child);