diff --git a/packages/react-native-gesture-handler/src/web/handlers/FlingGestureHandler.ts b/packages/react-native-gesture-handler/src/web/handlers/FlingGestureHandler.ts
index 8150c0a50c..3cbd458983 100644
--- a/packages/react-native-gesture-handler/src/web/handlers/FlingGestureHandler.ts
+++ b/packages/react-native-gesture-handler/src/web/handlers/FlingGestureHandler.ts
@@ -23,7 +23,7 @@ export default class FlingGestureHandler extends GestureHandler {
 
   private maxDurationMs = DEFAULT_MAX_DURATION_MS;
   private minVelocity = DEFAULT_MIN_VELOCITY;
-  private delayTimeout!: number;
+  private delayTimeout: ReturnType<typeof setTimeout> | undefined;
 
   private maxNumberOfPointersSimultaneously = 0;
   private keyPointer = NaN;