diff --git a/kscreenlocker.spec b/kscreenlocker.spec
index 9225feb..be29f0e 100644
--- a/kscreenlocker.spec
+++ b/kscreenlocker.spec
@@ -58,6 +58,7 @@ BuildRequires:  pkgconfig(xcb-keysyms)
 BuildRequires:  pkgconfig(xcursor)
 BuildRequires:  pkgconfig(xi)
 Requires(post): pam-config
+Requires(post): /usr/bin/killall
 %if %{with lang}
 Recommends:     %{name}-lang
 %else