diff --git a/extensions/transformiix/source/xslt/ProcessorState.cpp b/extensions/transformiix/source/xslt/ProcessorState.cpp
index e7ae2fddc38e..81c5075986f5 100644
--- a/extensions/transformiix/source/xslt/ProcessorState.cpp
+++ b/extensions/transformiix/source/xslt/ProcessorState.cpp
@@ -99,7 +99,7 @@ void txLoadedDocumentsHash::Add(Document* aDocument)
     }
 
     nsAutoString baseURI;
-    mSourceDocument->getBaseURI(baseURI);
+    aDocument->getBaseURI(baseURI);
     txLoadedDocumentEntry* entry = AddEntry(baseURI);
     if (entry) {
         entry->mDocument = aDocument;