diff --git a/pcsc-lite-ccid.spec b/pcsc-lite-ccid.spec
index 371daf6..e7eeb70 100644
--- a/pcsc-lite-ccid.spec
+++ b/pcsc-lite-ccid.spec
@@ -19,6 +19,8 @@ BuildRequires:  perl-Getopt-Long
 BuildRequires:  libusb1-devel
 BuildRequires:  pcsc-lite-devel >= %{pcsc_lite_ver}
 BuildRequires:  gnupg2 gcc
+BuildRequires:  flex
+BuildRequires:  zlib-devel
 Requires(post): systemd
 Requires(postun): systemd
 Requires:       pcsc-lite%{?_isa} >= %{pcsc_lite_ver}