diff --git a/Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.h b/Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.h
index d6ef85bad97c..7c6ec46e2151 100644
--- a/Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.h
+++ b/Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.h
@@ -293,6 +293,7 @@ class UnifiedPDFPlugin final : public PDFPluginBase, public WebCore::GraphicsLay
     void ensureLayers();
     void updatePageBackgroundLayers();
     void updateLayerHierarchy();
+    void updateLayerPositions();
 
     void didChangeScrollOffset() override;
     void didChangeIsInWindow();
diff --git a/Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.mm b/Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.mm
index d98c963b98bd..c7724c823f9d 100644
--- a/Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.mm
+++ b/Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.mm
@@ -481,6 +481,16 @@ static String mutationObserverNotificationString()
     didChangeIsInWindow();
 }
 
+void UnifiedPDFPlugin::updateLayerPositions()
+{
+    TransformationMatrix transform;
+    transform.scale(m_scaleFactor);
+    auto padding = centeringOffset();
+    transform.translate(padding.width(), padding.height());
+
+    m_contentsLayer->setTransform(transform);
+    m_pageBackgroundsContainerLayer->setTransform(transform);
+}
 
 std::pair<bool, bool> UnifiedPDFPlugin::shouldShowDebugIndicators() const
 {
@@ -849,14 +859,7 @@ static String mutationObserverNotificationString()
     if (!m_inMagnificationGesture)
         m_rootLayer->noteDeviceOrPageScaleFactorChangedIncludingDescendants();
 
-    TransformationMatrix transform;
-    transform.scale(m_scaleFactor);
-    auto padding = centeringOffset();
-    transform.translate(padding.width(), padding.height());
-
-    m_contentsLayer->setTransform(transform);
-    m_pageBackgroundsContainerLayer->setTransform(transform);
-
+    updateLayerPositions();
     updatePageBackgroundLayers();
     updateSnapOffsets();
 
@@ -929,6 +932,7 @@ static String mutationObserverNotificationString()
     }
 
     updateLayerHierarchy();
+    updateLayerPositions();
     updateScrollingExtents();
 
     if (shouldAdjustScale == AdjustScaleAfterLayout::Yes && m_view) {