diff --git a/types/eventsource/tsconfig.json b/types/eventsource/tsconfig.json
index 440f5427c3..4a714cf00a 100644
--- a/types/eventsource/tsconfig.json
+++ b/types/eventsource/tsconfig.json
@@ -6,8 +6,8 @@
             "dom"
         ],
         "noImplicitAny": true,
-        "noImplicitThis": false,
-        "strictNullChecks": false,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
         "strictFunctionTypes": true,
         "baseUrl": "../",
         "typeRoots": [