diff --git a/layout/style/ServoBindings.cpp b/layout/style/ServoBindings.cpp
index a000ef881291..8f9203bcf9a6 100644
--- a/layout/style/ServoBindings.cpp
+++ b/layout/style/ServoBindings.cpp
@@ -802,16 +802,16 @@ Gecko_CopyStyleContentsFrom(nsStyleContent* aContent, const nsStyleContent* aOth
 }
 
 void
-Gecko_EnsureImageLayersLength(nsStyleImageLayers* aLayers, size_t aLen)
+Gecko_EnsureImageLayersLength(nsStyleImageLayers* aLayers, size_t aLen,
+                              nsStyleImageLayers::LayerType aLayerType)
 {
-  aLayers->mLayers.EnsureLengthAtLeast(aLen);
-}
+  size_t oldLength = aLayers->mLayers.Length();
 
-void
-Gecko_InitializeImageLayer(nsStyleImageLayers::Layer* aLayer,
-                                nsStyleImageLayers::LayerType aLayerType)
-{
-  aLayer->Initialize(aLayerType);
+  aLayers->mLayers.EnsureLengthAtLeast(aLen);
+
+  for (size_t i = oldLength; i < aLen; ++i) {
+    aLayers->mLayers[i].Initialize(aLayerType);
+  }
 }
 
 void
diff --git a/layout/style/ServoBindings.h b/layout/style/ServoBindings.h
index 8d67342ffa60..47606234d392 100644
--- a/layout/style/ServoBindings.h
+++ b/layout/style/ServoBindings.h
@@ -300,10 +300,8 @@ void Gecko_ClearPODTArray(void* array, size_t elem_size, size_t elem_align);
 void Gecko_ClearStyleContents(nsStyleContent* content);
 void Gecko_CopyStyleContentsFrom(nsStyleContent* content, const nsStyleContent* other);
 
-void Gecko_EnsureImageLayersLength(nsStyleImageLayers* layers, size_t len);
-
-void Gecko_InitializeImageLayer(nsStyleImageLayers::Layer* layer,
-                                nsStyleImageLayers::LayerType layer_type);
+void Gecko_EnsureImageLayersLength(nsStyleImageLayers* layers, size_t len,
+                                   nsStyleImageLayers::LayerType layer_type);
 
 // Clean up pointer-based coordinates
 void Gecko_ResetStyleCoord(nsStyleUnit* unit, nsStyleUnion* value);