diff --git a/content/svg/content/src/nsSVGMaskElement.cpp b/content/svg/content/src/nsSVGMaskElement.cpp
index 6e8f4372c7c..46857b57417 100644
--- a/content/svg/content/src/nsSVGMaskElement.cpp
+++ b/content/svg/content/src/nsSVGMaskElement.cpp
@@ -157,6 +157,7 @@ nsSVGMaskElement::IsAttributeMapped(const nsIAtom* name) const
     sFiltersMap,
     sFontSpecificationMap,
     sGradientStopMap,
+    sGraphicsMap,
     sMarkersMap,
     sTextContentElementsMap,
     sViewportsMap
diff --git a/layout/reftests/svg/mask-basic-02-ref.svg b/layout/reftests/svg/mask-basic-02-ref.svg
new file mode 100644
index 00000000000..ac4e7f3f32b
--- /dev/null
+++ b/layout/reftests/svg/mask-basic-02-ref.svg
@@ -0,0 +1,11 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg">
+
+  <title>Reference that mask defaults to sRGB</title>
+
+  <rect width="100" height="100" x="100" y="100"  fill="#FFC0C0"/>
+
+</svg>
diff --git a/layout/reftests/svg/mask-basic-02.svg b/layout/reftests/svg/mask-basic-02.svg
new file mode 100644
index 00000000000..71204df0e7a
--- /dev/null
+++ b/layout/reftests/svg/mask-basic-02.svg
@@ -0,0 +1,17 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+
+  <title>Testcase that mask defaults to sRGB</title>
+
+  <defs>
+    <mask id="mask" maskContentUnits="objectBoundingBox">
+        <rect width="1" height="1" fill="#3f3f3f" />
+    </mask>
+  </defs>
+
+  <rect width="100" height="100" x="100" y="100" mask="url(#mask)" fill="#FF0000"/>
+
+</svg>
diff --git a/layout/reftests/svg/reftest.list b/layout/reftests/svg/reftest.list
index cbe068d19f5..015e98541f9 100644
--- a/layout/reftests/svg/reftest.list
+++ b/layout/reftests/svg/reftest.list
@@ -145,6 +145,7 @@ fails == inline-in-xul-basic-01.xul pass.svg
 == marker-attribute-01.svg pass.svg
 == marker-viewBox-01.svg marker-viewBox-01-ref.svg
 == mask-basic-01.svg pass.svg
+== mask-basic-02.svg mask-basic-02-ref.svg
 == mask-containing-masked-content-01.svg pass.svg
 == mask-transformed-01.svg mask-transformed-01-ref.svg
 == nested-viewBox-01.svg pass.svg
diff --git a/layout/svg/base/src/nsSVGMaskFrame.cpp b/layout/svg/base/src/nsSVGMaskFrame.cpp
index 7102e97afba..c7589ffecff 100644
--- a/layout/svg/base/src/nsSVGMaskFrame.cpp
+++ b/layout/svg/base/src/nsSVGMaskFrame.cpp
@@ -138,7 +138,10 @@ nsSVGMaskFrame::ComputeMaskAlpha(nsSVGRenderState *aContext,
 
   nsIntRect rect(0, 0, surfaceSize.width, surfaceSize.height);
   nsSVGUtils::UnPremultiplyImageDataAlpha(data, stride, rect);
-  nsSVGUtils::ConvertImageDataToLinearRGB(data, stride, rect);
+  if (GetStyleSVG()->mColorInterpolation ==
+      NS_STYLE_COLOR_INTERPOLATION_LINEARRGB) {
+    nsSVGUtils::ConvertImageDataToLinearRGB(data, stride, rect);
+  }
 
   for (PRInt32 y = 0; y < surfaceSize.height; y++)
     for (PRInt32 x = 0; x < surfaceSize.width; x++) {
@@ -160,6 +163,13 @@ nsSVGMaskFrame::ComputeMaskAlpha(nsSVGRenderState *aContext,
   return retval;
 }
 
+/* virtual */ void
+nsSVGMaskFrame::DidSetStyleContext(nsStyleContext* aOldStyleContext)
+{
+  nsSVGEffects::InvalidateRenderingObservers(this);
+  nsSVGMaskFrameBase::DidSetStyleContext(aOldStyleContext);
+}
+
 NS_IMETHODIMP
 nsSVGMaskFrame::AttributeChanged(PRInt32  aNameSpaceID,
                                  nsIAtom* aAttribute,
diff --git a/layout/svg/base/src/nsSVGMaskFrame.h b/layout/svg/base/src/nsSVGMaskFrame.h
index f069b8d387d..245645ca816 100644
--- a/layout/svg/base/src/nsSVGMaskFrame.h
+++ b/layout/svg/base/src/nsSVGMaskFrame.h
@@ -63,6 +63,8 @@ public:
                                                 const gfxMatrix &aMatrix,
                                                 float aOpacity = 1.0f);
 
+  virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext);
+
   NS_IMETHOD AttributeChanged(PRInt32         aNameSpaceID,
                               nsIAtom*        aAttribute,
                               PRInt32         aModType);