diff --git a/rdf/src/nsRDFBuiltInDataSources.h b/rdf/src/nsRDFBuiltInDataSources.h
index db2ce8770747..6dea80bad36e 100644
--- a/rdf/src/nsRDFBuiltInDataSources.h
+++ b/rdf/src/nsRDFBuiltInDataSources.h
@@ -38,6 +38,9 @@ nsresult NS_NewRDFMemoryDataSource(nsIRDFDataSource** result);
 // in nsSimpleDataBase.cpp
 nsresult NS_NewRDFSimpleDataBase(nsIRDFDataBase** result);
 
+// in nsStreamDataSource.cpp
+nsresult NS_NewRDFStreamDataSource(nsIRDFDataSource** result);
+
 #endif // nsBuiltinDataSources_h__