diff --git a/gfx/src/thebes/nsThebesRenderingContext.cpp b/gfx/src/thebes/nsThebesRenderingContext.cpp
index 6e99e81018d..064b1a8c740 100644
--- a/gfx/src/thebes/nsThebesRenderingContext.cpp
+++ b/gfx/src/thebes/nsThebesRenderingContext.cpp
@@ -81,8 +81,9 @@ static NS_DEFINE_CID(kRegionCID, NS_REGION_CID);
 
 NS_IMPL_ISUPPORTS1(nsThebesRenderingContext, nsIRenderingContext)
 
-nsThebesRenderingContext::nsThebesRenderingContext() :
-    mLineStyle(nsLineStyle_kNone)
+nsThebesRenderingContext::nsThebesRenderingContext()
+  : mLineStyle(nsLineStyle_kNone)
+  , mColor(NS_RGB(0,0,0))
 {
 }