diff --git a/mozilla/extensions/auth/nsAuthSambaNTLM.cpp b/mozilla/extensions/auth/nsAuthSambaNTLM.cpp
index f924249bf54..44272d3cb6e 100644
--- a/mozilla/extensions/auth/nsAuthSambaNTLM.cpp
+++ b/mozilla/extensions/auth/nsAuthSambaNTLM.cpp
@@ -39,6 +39,7 @@
 #include "nsAuthSambaNTLM.h"
 #include "prenv.h"
 #include "plbase64.h"
+#include "prerror.h"
 
 #include <stdlib.h>