diff --git a/types/redux-immutable/tsconfig.json b/types/redux-immutable/tsconfig.json
index f1a4a5fd83..8d4f3d7772 100644
--- a/types/redux-immutable/tsconfig.json
+++ b/types/redux-immutable/tsconfig.json
@@ -6,7 +6,7 @@
             "dom"
         ],
         "noImplicitAny": true,
-        "noImplicitThis": false,
+        "noImplicitThis": true,
         "strictNullChecks": true,
         "strictFunctionTypes": true,
         "baseUrl": "../",
diff --git a/types/redux-immutable/v3/tsconfig.json b/types/redux-immutable/v3/tsconfig.json
index a976cd4323..54cd5bdbda 100644
--- a/types/redux-immutable/v3/tsconfig.json
+++ b/types/redux-immutable/v3/tsconfig.json
@@ -6,7 +6,7 @@
             "dom"
         ],
         "noImplicitAny": true,
-        "noImplicitThis": false,
+        "noImplicitThis": true,
         "strictNullChecks": true,
         "strictFunctionTypes": true,
         "baseUrl": "../../",