diff --git a/src/core/game/GameUpdates.ts b/src/core/game/GameUpdates.ts
index 397bcb071..dbff0c5c3 100644
--- a/src/core/game/GameUpdates.ts
+++ b/src/core/game/GameUpdates.ts
@@ -93,7 +93,7 @@ export interface PlayerUpdate {
   type: GameUpdateType.Player;
   nameViewData?: NameViewData;
   clientID: ClientID | null;
-  pattern: string | undefined;
+  pattern: string | undefined | null;
   flag: string | undefined;
   name: string;
   displayName: string;
diff --git a/src/core/game/PlayerImpl.ts b/src/core/game/PlayerImpl.ts
index 31f0e5419..d33aa9416 100644
--- a/src/core/game/PlayerImpl.ts
+++ b/src/core/game/PlayerImpl.ts
@@ -80,7 +80,7 @@ export class PlayerImpl implements Player {
   public _units: Unit[] = [];
   public _tiles: Set<TileRef> = new Set();
 
-  private _pattern: string | undefined;
+  private _pattern: string | undefined | null;
   private _flag: string | undefined;
   private _name: string;
   private _displayName: string;
@@ -179,7 +179,7 @@ export class PlayerImpl implements Player {
     return this._smallID;
   }
 
-  pattern(): string | undefined {
+  pattern(): string | undefined | null {
     return this._pattern;
   }