diff --git a/engine/src/flutter/shell/common/animator.h b/engine/src/flutter/shell/common/animator.h
index effc0111100..cd2fff454e2 100644
--- a/engine/src/flutter/shell/common/animator.h
+++ b/engine/src/flutter/shell/common/animator.h
@@ -108,7 +108,7 @@ class Animator final {
   bool frame_scheduled_;
   int notify_idle_task_id_;
   bool dimension_change_pending_;
-  SkISize last_layer_tree_size_;
+  SkISize last_layer_tree_size_ = {0, 0};
   std::deque<uint64_t> trace_flow_ids_;
 
   fml::WeakPtrFactory<Animator> weak_factory_;