diff --git a/opensc.spec b/opensc.spec
index bad3d2e..21b5a6b 100644
--- a/opensc.spec
+++ b/opensc.spec
@@ -25,6 +25,7 @@ BuildRequires:  docbook-style-xsl
 BuildRequires:  autoconf automake libtool gcc
 BuildRequires:  desktop-file-utils
 BuildRequires:  bash-completion
+BuildRequires:  zlib-devel
 Requires:       pcsc-lite-libs%{?_isa}
 Requires:	pcsc-lite
 Obsoletes:      mozilla-opensc-signer < 0.12.0