diff --git a/types/source-map-support/source-map-support-tests.ts b/types/source-map-support/source-map-support-tests.ts
index 7b07c2970f..cb773b9958 100644
--- a/types/source-map-support/source-map-support-tests.ts
+++ b/types/source-map-support/source-map-support-tests.ts
@@ -41,3 +41,5 @@ p = sms.mapSourcePosition(p);
 
 let u: sms.UrlAndMap | null;
 u = retrieveSourceMap("foo");
+
+sms.resetRetrieveHandlers();