diff --git a/ghc-HTTP.spec b/ghc-HTTP.spec
index 2f618e2..77fd190 100644
--- a/ghc-HTTP.spec
+++ b/ghc-HTTP.spec
@@ -4,7 +4,7 @@
 
 %global common_description A Haskell library for client-side HTTP.
 
-%global ghc_pkg_deps ghc-network-devel
+%global ghc_pkg_deps ghc-network-devel ghc-mtl-devel
 
 %bcond_without shared
 
@@ -68,6 +68,7 @@ rm -rf $RPM_BUILD_ROOT
 - use ghc_lib_package and ghc_pkg_deps
 - build shared library
 - drop redundant buildroot and its install cleaning
+- buildrequires mtl
 
 * Mon Nov 16 2009 Jens Petersen <petersen@redhat.com> - 4000.0.6-6
 - use %%ghc_pkg_ver for requires