diff --git a/seahorse.spec b/seahorse.spec
index a4bf29e..e482d7d 100644
--- a/seahorse.spec
+++ b/seahorse.spec
@@ -30,6 +30,7 @@ BuildRequires:  avahi-glib-devel
 BuildRequires:  intltool
 BuildRequires:  dbus-glib-devel
 BuildRequires:  gobject-introspection-devel >= 0.6.4
+BuildRequires:  libSM-devel
 # for g-ir-scanner
 BuildRequires:  libtool
 Requires(post): desktop-file-utils