diff --git a/docshell/base/nsAboutRedirector.cpp b/docshell/base/nsAboutRedirector.cpp
index 669196c43448..e306f9ea68b5 100644
--- a/docshell/base/nsAboutRedirector.cpp
+++ b/docshell/base/nsAboutRedirector.cpp
@@ -22,6 +22,7 @@
  */
 
 #include "nsAboutRedirector.h"
+#include "nsNetCID.h"
 #include "nsIIOService.h"
 #include "nsIServiceManager.h"
 #include "nsCOMPtr.h"