diff --git a/ghc-zlib.spec b/ghc-zlib.spec
index 14307ec..bfcd633 100644
--- a/ghc-zlib.spec
+++ b/ghc-zlib.spec
@@ -28,6 +28,7 @@ ExcludeArch:    %{ghc_excluded_archs}
 BuildRequires:  ghc-Cabal-devel
 BuildRequires:  ghc-rpm-macros
 BuildRequires:  hscolour
+BuildRequires:  ghc-bytestring-prof
 %{?ghc_pkg_c_deps:BuildRequires:  %{ghc_pkg_c_deps}}
 
 %description