diff --git a/mail/mail-format.c b/mail/mail-format.c
index 07b49ffb0a..2ec9487187 100644
--- a/mail/mail-format.c
+++ b/mail/mail-format.c
@@ -30,6 +30,7 @@
 #include "mail-crypto.h"
 #include "shell/e-setup.h"
 #include "e-util/e-html-utils.h"
+#include <gal/widgets/e-unicode.h>
 #include <camel/camel-mime-utils.h>
 #include <libgnome/libgnome.h>
 #include <libgnomevfs/gnome-vfs-mime-info.h>