diff --git a/gfx/thebes/gfxDWriteFontList.cpp b/gfx/thebes/gfxDWriteFontList.cpp
index 66dc00fe5d0..cee077d3482 100644
--- a/gfx/thebes/gfxDWriteFontList.cpp
+++ b/gfx/thebes/gfxDWriteFontList.cpp
@@ -1102,6 +1102,17 @@ gfxFontFamily* gfxDWriteFontList::FindFamily(const nsAString& aFamily)
     return gfxPlatformFontList::FindFamily(aFamily);
 }
 
+void
+gfxDWriteFontList::GetFontFamilyList(nsTArray<nsRefPtr<gfxFontFamily> >& aFamilyArray)
+{
+    if (!mInitialized) {
+        mInitialized = PR_TRUE;
+        DelayedInitFontList();
+    }
+
+    return gfxPlatformFontList::GetFontFamilyList(aFamilyArray);
+}
+
 PRBool 
 gfxDWriteFontList::ResolveFontName(const nsAString& aFontName,
                                    nsAString& aResolvedFontName)
diff --git a/gfx/thebes/gfxDWriteFontList.h b/gfx/thebes/gfxDWriteFontList.h
index fa9cb0609ac..ed2d309f884 100644
--- a/gfx/thebes/gfxDWriteFontList.h
+++ b/gfx/thebes/gfxDWriteFontList.h
@@ -225,6 +225,8 @@ public:
 
     virtual gfxFontFamily* FindFamily(const nsAString& aFamily);
 
+    virtual void GetFontFamilyList(nsTArray<nsRefPtr<gfxFontFamily> >& aFamilyArray);
+
 private:
     friend class gfxDWriteFontFamily;
 
diff --git a/gfx/thebes/gfxPlatformFontList.h b/gfx/thebes/gfxPlatformFontList.h
index 3c51a1de47d..0f1f7ecad81 100644
--- a/gfx/thebes/gfxPlatformFontList.h
+++ b/gfx/thebes/gfxPlatformFontList.h
@@ -93,7 +93,7 @@ public:
 
     void ClearPrefFonts() { mPrefFonts.Clear(); }
 
-    void GetFontFamilyList(nsTArray<nsRefPtr<gfxFontFamily> >& aFamilyArray);
+    virtual void GetFontFamilyList(nsTArray<nsRefPtr<gfxFontFamily> >& aFamilyArray);
 
     gfxFontEntry* FindFontForChar(const PRUint32 aCh, gfxFont *aPrevFont);