diff --git a/types/screeps/index.d.ts b/types/screeps/index.d.ts
index 4b8f0f76f6..145c240b39 100644
--- a/types/screeps/index.d.ts
+++ b/types/screeps/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for Screeps
+// Type definitions for Screeps 2.1
 // Project: https://github.com/screeps/screeps
 // Definitions by: Marko Sulamägi <https://github.com/MarkoSulamagi>
 //                 Nhan Ho <https://github.com/NhanHo>
@@ -1110,7 +1110,7 @@ interface Game {
     notify(message: string, groupInterval?: number): undefined;
 }
 
-declare const Game: Game;
+declare let Game: Game;
 interface _HasRoomPosition {
     pos: RoomPosition;
 }
@@ -3259,7 +3259,7 @@ interface StructureController extends OwnedStructure<STRUCTURE_CONTROLLER> {
     /**
      * An object with the controller reservation info if present: username, ticksToEnd
      */
-    reservation: ReservationDefinition;
+    reservation: ReservationDefinition | undefined;
     /**
      * How many ticks of safe mode are remaining, or undefined.
      */
@@ -3275,7 +3275,7 @@ interface StructureController extends OwnedStructure<STRUCTURE_CONTROLLER> {
     /**
      * An object with the controller sign info if present
      */
-    sign: SignDefinition;
+    sign: SignDefinition | undefined;
     /**
      * The amount of game ticks when this controller will lose one level. This timer can be reset by using Creep.upgradeController.
      */
diff --git a/types/screeps/tsconfig.json b/types/screeps/tsconfig.json
index 95f515e31c..0e153958c2 100644
--- a/types/screeps/tsconfig.json
+++ b/types/screeps/tsconfig.json
@@ -20,5 +20,4 @@
         "index.d.ts",
         "screeps-tests.ts"
     ]
-}
-  
\ No newline at end of file
+  }
diff --git a/types/screeps/tslint.json b/types/screeps/tslint.json
index a94a85698c..f3ea5020c6 100644
--- a/types/screeps/tslint.json
+++ b/types/screeps/tslint.json
@@ -1,12 +1,12 @@
 {
-	"extends": "dtslint/dt.json",
-	"rules": {
-			"no-redundant-jsdoc-2": false,
-			"dt-header": false,
-			"no-empty-interface": false,
-			"no-unnecessary-generics": false,
-			"no-misused-new": false,
-			"no-any-union": false,
-			"no-redundant-undefined": false
-	}
+    "extends": "dtslint/dt.json",
+    "rules": {
+        "no-redundant-jsdoc-2": false,
+        "dt-header": false,
+        "no-empty-interface": false,
+        "no-unnecessary-generics": false,
+        "no-misused-new": false,
+        "no-any-union": false,
+        "no-redundant-undefined": false
+    }
 }