diff --git a/src/harness/loggedIO.ts b/src/harness/loggedIO.ts
index afc1cfcbcbc..e4c6c712f14 100644
--- a/src/harness/loggedIO.ts
+++ b/src/harness/loggedIO.ts
@@ -225,7 +225,7 @@ namespace Playback {
             },
             (path, extension, exclude) => findResultByPath(wrapper,
                     replayLog.directoriesRead.filter(
-                        (d) => {
+                        d => {
                             if (d.extension === extension) {
                                 if (d.exclude) {
                                     return ts.arrayIsEqualTo(d.exclude, exclude);