diff --git a/layout/style/nsDOMCSSRGBColor.cpp b/layout/style/nsDOMCSSRGBColor.cpp
index 11963f1fd082..ad936edf36fd 100644
--- a/layout/style/nsDOMCSSRGBColor.cpp
+++ b/layout/style/nsDOMCSSRGBColor.cpp
@@ -29,15 +29,17 @@ nsDOMCSSRGBColor::~nsDOMCSSRGBColor(void)
 
 DOMCI_DATA(CSSRGBColor, nsDOMCSSRGBColor)
 
-NS_INTERFACE_MAP_BEGIN(nsDOMCSSRGBColor)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMCSSRGBColor)
   NS_INTERFACE_MAP_ENTRY(nsIDOMRGBColor)
   NS_INTERFACE_MAP_ENTRY(nsIDOMNSRGBAColor)
   NS_INTERFACE_MAP_ENTRY(nsISupports)
   NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(CSSRGBColor)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
 NS_INTERFACE_MAP_END
 
-NS_IMPL_ADDREF(nsDOMCSSRGBColor)
-NS_IMPL_RELEASE(nsDOMCSSRGBColor)
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_4(nsDOMCSSRGBColor, mAlpha,  mBlue, mGreen, mRed)
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMCSSRGBColor)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMCSSRGBColor)
 
 
 NS_IMETHODIMP
diff --git a/layout/style/nsDOMCSSRGBColor.h b/layout/style/nsDOMCSSRGBColor.h
index bd2f8de27d4e..e78921c7dd24 100644
--- a/layout/style/nsDOMCSSRGBColor.h
+++ b/layout/style/nsDOMCSSRGBColor.h
@@ -11,10 +11,13 @@
 #include "nsAutoPtr.h"
 #include "nsISupports.h"
 #include "nsIDOMNSRGBAColor.h"
+#include "nsWrapperCache.h"
 
 class nsROCSSPrimitiveValue;
 
-class nsDOMCSSRGBColor : public nsIDOMNSRGBAColor {
+class nsDOMCSSRGBColor : public nsIDOMNSRGBAColor,
+                         public nsWrapperCache
+{
 public:
   nsDOMCSSRGBColor(nsROCSSPrimitiveValue* aRed,
                    nsROCSSPrimitiveValue* aGreen,
@@ -24,10 +27,12 @@ public:
 
   virtual ~nsDOMCSSRGBColor(void);
 
-  NS_DECL_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
   NS_DECL_NSIDOMRGBCOLOR
   NS_DECL_NSIDOMNSRGBACOLOR
 
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsDOMCSSRGBColor)
+
   bool HasAlpha() const { return mHasAlpha; }
 
   // RGBColor webidl interface