diff --git a/lib/src/rendering/sliver_sticky_header.dart b/lib/src/rendering/sliver_sticky_header.dart
index 83b7262..fae3434 100644
--- a/lib/src/rendering/sliver_sticky_header.dart
+++ b/lib/src/rendering/sliver_sticky_header.dart
@@ -343,7 +343,7 @@ class RenderSliverStickyHeader extends RenderSliver with RenderSliverHelpers {
   double childScrollOffset(RenderObject child) {
     assert(child.parent == this);
     if (child == this.child) {
-      return _headerExtent;
+      return headerLogicalExtent;
     } else {
       return super.childScrollOffset(child);
     }