diff --git a/libs/vr/libvrflinger/hardware_composer.cpp b/libs/vr/libvrflinger/hardware_composer.cpp
index d937c88..4479d1e 100644
--- a/libs/vr/libvrflinger/hardware_composer.cpp
+++ b/libs/vr/libvrflinger/hardware_composer.cpp
@@ -408,7 +408,7 @@
   }
 
   const bool is_frame_pending = IsFramePendingInDriver();
-  const bool is_fence_pending = retire_fence_fds_.size() >
+  const bool is_fence_pending = static_cast<int32_t>(retire_fence_fds_.size()) >
                                 post_thread_config_.allowed_pending_fence_count;
 
   if (is_fence_pending || is_frame_pending) {