diff --git a/types/html5-history/tsconfig.json b/types/html5-history/tsconfig.json
index 08937c1353..b4bc53cbb5 100644
--- a/types/html5-history/tsconfig.json
+++ b/types/html5-history/tsconfig.json
@@ -7,7 +7,7 @@
         ],
         "noImplicitAny": true,
         "noImplicitThis": true,
-        "strictNullChecks": false,
+        "strictNullChecks": true,
         "strictFunctionTypes": true,
         "baseUrl": "../",
         "typeRoots": [
@@ -21,4 +21,4 @@
         "index.d.ts",
         "html5-history-tests.ts"
     ]
-}
\ No newline at end of file
+}