diff --git a/mozilla/network/protocol/about/mkabout.c b/mozilla/network/protocol/about/mkabout.c
index 63c3b8f3221..7fc010e4938 100644
--- a/mozilla/network/protocol/about/mkabout.c
+++ b/mozilla/network/protocol/about/mkabout.c
@@ -15,6 +15,7 @@
 #include "httpauth.h"
 #include "mkstream.h"
 #include "glhist.h"
+#include "shist.h"
 
 #include "abouturl.h"