diff --git a/mozilla/network/protocol/about/mkabout.c b/mozilla/network/protocol/about/mkabout.c
index e32ebc68954..495d7d7aaf1 100644
--- a/mozilla/network/protocol/about/mkabout.c
+++ b/mozilla/network/protocol/about/mkabout.c
@@ -16,6 +16,8 @@
 #include "mkstream.h"
 #include "glhist.h"
 #include "shist.h"
+#include "prmem.h"
+#include "plstr.h"
 
 #include "abouturl.h"