diff --git a/dom/base/FragmentOrElement.cpp b/dom/base/FragmentOrElement.cpp
index bfb9c40b2e..0f919c97f0 100644
--- a/dom/base/FragmentOrElement.cpp
+++ b/dom/base/FragmentOrElement.cpp
@@ -1921,7 +1921,7 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(FragmentOrElement)
     }
 
     nsAutoCString orphan;
-    if (!tmp->IsInUncomposedDoc() &&
+    if (!tmp->IsInComposedDoc() &&
         // Ignore xbl:content, which is never in the document and hence always
         // appears to be orphaned.
         !tmp->NodeInfo()->Equals(nsGkAtoms::content, kNameSpaceID_XBL)) {