diff --git a/layout/svg/nsCSSFilterInstance.cpp b/layout/svg/nsCSSFilterInstance.cpp
index f118264f56b..f6edc0f350d 100644
--- a/layout/svg/nsCSSFilterInstance.cpp
+++ b/layout/svg/nsCSSFilterInstance.cpp
@@ -324,8 +324,8 @@ nsCSSFilterInstance::BlurRadiusToFilterSpace(nscoord aRadiusInFrameSpace)
     nsPresContext::AppUnitsToFloatCSSPixels(aRadiusInFrameSpace);
 
   // Convert the radius to filter space.
-  gfxSize radiusInFilterSpace(radiusInFrameSpaceInCSSPx,
-                              radiusInFrameSpaceInCSSPx);
+  Size radiusInFilterSpace(radiusInFrameSpaceInCSSPx,
+                           radiusInFrameSpaceInCSSPx);
   gfxSize frameSpaceInCSSPxToFilterSpaceScale =
     mFrameSpaceInCSSPxToFilterSpaceTransform.ScaleFactors(true);
   radiusInFilterSpace.Scale(frameSpaceInCSSPxToFilterSpaceScale.width,
@@ -336,11 +336,11 @@ nsCSSFilterInstance::BlurRadiusToFilterSpace(nscoord aRadiusInFrameSpace)
     NS_NOTREACHED("we shouldn't have parsed a negative radius in the style");
     return Size();
   }
-  gfxFloat maxStdDeviation = (gfxFloat)kMaxStdDeviation;
+  Float maxStdDeviation = (Float)kMaxStdDeviation;
   radiusInFilterSpace.width = std::min(radiusInFilterSpace.width, maxStdDeviation);
   radiusInFilterSpace.height = std::min(radiusInFilterSpace.height, maxStdDeviation);
 
-  return ToSize(radiusInFilterSpace);
+  return radiusInFilterSpace;
 }
 
 IntPoint