diff --git a/gfx/layers/apz/src/InputBlockState.cpp b/gfx/layers/apz/src/InputBlockState.cpp
index 0525b522c51..703c5508ef0 100644
--- a/gfx/layers/apz/src/InputBlockState.cpp
+++ b/gfx/layers/apz/src/InputBlockState.cpp
@@ -51,6 +51,7 @@ InputBlockState::SetConfirmedTargetApzc(const nsRefPtr<AsyncPanZoomController>&
 
   // note that aTargetApzc MAY be null here.
   mTargetApzc = aTargetApzc;
+  mTransformToApzc = aTargetApzc ? aTargetApzc->GetTransformToThis() : gfx::Matrix4x4();
   mOverscrollHandoffChain = (mTargetApzc ? mTargetApzc->BuildOverscrollHandoffChain() : nullptr);
   return true;
 }