diff --git a/kdelibs.spec b/kdelibs.spec
index 25aeb89..10b4811 100644
--- a/kdelibs.spec
+++ b/kdelibs.spec
@@ -130,7 +130,7 @@ BuildRequires: strigi-devel >= 0.6.3
 BuildRequires: zlib-devel
 BuildRequires: libutempter-devel
 # extra X deps (seemingly needed and/or checked-for by most kde4 buildscripts)
-%define x_deps libXcomposite-devel libXdamage-devel libxkbfile-devel libXpm-devel libXScrnSaver-devel libXtst-devel libXv-devel libXxf86misc-devel
+%define x_deps libSM-devel libXcomposite-devel libXdamage-devel libxkbfile-devel libXpm-devel libXScrnSaver-devel libXtst-devel libXv-devel libXxf86misc-devel
 %{?x_deps:BuildRequires: %{x_deps}}
 BuildRequires: openssh-clients
 BuildRequires: subversion