diff --git a/types/fscreen/tsconfig.json b/types/fscreen/tsconfig.json
index 74c4dc119b..e352d9fd2e 100644
--- a/types/fscreen/tsconfig.json
+++ b/types/fscreen/tsconfig.json
@@ -10,6 +10,7 @@
         "strictNullChecks": true,
         "baseUrl": "../",
         "target": "es6",
+        "strictFunctionTypes": true,
         "typeRoots": [
             "../"
         ],