diff --git a/pam.spec b/pam.spec
index 071dce6..32fd4d8 100644
--- a/pam.spec
+++ b/pam.spec
@@ -91,6 +91,7 @@ BuildRequires:	openssl-devel
 BuildRequires:	libaudit-devel
 BuildRequires:	glibc-crypt_blowfish-devel
 BuildRequires:  gettext-devel
+BuildRequires:  pkgconfig(libtirpc)
 %if %with_prelude
 BuildRequires:	prelude-devel >= 0.9.0
 %else