diff --git a/xpcom/tests/PropertiesTest.cpp b/xpcom/tests/PropertiesTest.cpp
index 9d197936e3ab..918889d671c4 100644
--- a/xpcom/tests/PropertiesTest.cpp
+++ b/xpcom/tests/PropertiesTest.cpp
@@ -33,6 +33,7 @@ static NS_DEFINE_CID(kIOServiceCID, NS_IOSERVICE_CID);
 #endif // NECKO
 #include "nsIComponentManager.h"
 #include "nsIEnumerator.h"
+#include <iostream.h>  //BAD DOG -- no biscuit!
 
 #include "nsSpecialSystemDirectory.h"
 
diff --git a/xpcom/tests/TestObserverService.cpp b/xpcom/tests/TestObserverService.cpp
index 9c8c190a6218..f42379023a74 100644
--- a/xpcom/tests/TestObserverService.cpp
+++ b/xpcom/tests/TestObserverService.cpp
@@ -23,6 +23,7 @@
 #include "nsIObserver.h"
 #include "nsString.h"
 #include "prprf.h"
+#include <iostream.h>
 
 static nsIObserverService *anObserverService = NULL;