diff --git a/rpm/libzypp.spec b/rpm/libzypp.spec
index 0bcfb4f..303b19a 100644
--- a/rpm/libzypp.spec
+++ b/rpm/libzypp.spec
@@ -20,6 +20,7 @@ BuildRequires:  pkgconfig(libproxy-1.0)
 BuildRequires:  libsolv-devel >= 0.6.8
 Requires:       libsolv-tools >= 0.6.8
 Requires:       libsolv0 >= 0.6.8
+Requires:       lsof
 BuildRequires:  expat-devel
 BuildRequires:  glib2-devel
 BuildRequires:  popt-devel