--- a/layout/base/nsDisplayList.cpp
+++ b/layout/base/nsDisplayList.cpp
@@ -271,17 +271,17 @@ static void
 AddAnimationsForProperty(nsIFrame* aFrame, nsCSSProperty aProperty,
                          ElementAnimation* ea, Layer* aLayer,
                          AnimationData& aData)
 {
   NS_ASSERTION(aLayer->AsContainerLayer(), "Should only animate ContainerLayer");
   nsStyleContext* styleContext = aFrame->GetStyleContext();
   nsPresContext* presContext = aFrame->PresContext();
   nsRect bounds = nsDisplayTransform::GetFrameBoundsForTransform(aFrame);
-  float scale = nsDeviceContext::AppUnitsPerCSSPixel();
+  float scale = presContext->AppUnitsPerDevPixel();
   float iterations = ea->mIterationCount != NS_IEEEPositiveInfinity()
                      ? ea->mIterationCount : -1;
   for (PRUint32 propIdx = 0; propIdx < ea->mProperties.Length(); propIdx++) {
     AnimationProperty* property = &ea->mProperties[propIdx];
     InfallibleTArray<AnimationSegment> segments;
 
     if (aProperty != property->mProperty) {
       continue;