diff --git a/src/testRunner/unittests/moduleResolution.ts b/src/testRunner/unittests/moduleResolution.ts
index f0a1ad3face..155a03b1fb6 100644
--- a/src/testRunner/unittests/moduleResolution.ts
+++ b/src/testRunner/unittests/moduleResolution.ts
@@ -336,7 +336,7 @@ namespace ts {
             );
             const compilerOptions: CompilerOptions = { moduleResolution: ModuleResolutionKind.NodeJs };
             const cache = createModuleResolutionCache("/", (f) => f);
-            let resolution = resolveModuleName("a", "/sub/foo.ts", compilerOptions, host, cache);
+            let resolution = resolveModuleName("a", "/sub/dir/foo.ts", compilerOptions, host, cache);
             checkResolvedModule(resolution.resolvedModule, {
                 extension: Extension.Ts,
                 isExternalLibraryImport: true,