diff --git a/libcacard.spec b/libcacard.spec
index ed5240e..bf86337 100644
--- a/libcacard.spec
+++ b/libcacard.spec
@@ -7,7 +7,7 @@ License:        LGPLv2+
 URL:            http://www.qemu.org/
 Source0:        http://wiki.qemu.org/download/qemu-%{version}.tar.bz2
 Patch00:        0001-libcacard-build-vscclient-from-root-only.patch
-BuildRequires:  nss-devel >= 3.12.8-2 libtool python
+BuildRequires:  nss-devel >= 3.12.8-2 libtool python zlib-devel
 
 %description
 Common Access Card (CAC) emulation library.