diff --git a/src/app/primitives/appstate/yaku.ts b/src/app/primitives/appstate/yaku.ts
index 257bc5e..e85ab07 100644
--- a/src/app/primitives/appstate/yaku.ts
+++ b/src/app/primitives/appstate/yaku.ts
@@ -159,6 +159,8 @@ function _removeYakuFromProps(outcome: AppOutcome, id: YakuId, props: WinProps,
   if (-1 === props.possibleFu.indexOf(props.fu)) {
     props.fu = props.possibleFu[0];
   }
+
+  return true;
 }
 
 export function removeYaku(outcome: AppOutcome, id: YakuId, mrWinner: number): void {