diff --git a/ghc-regex-base.spec b/ghc-regex-base.spec
index 90292e4..166987b 100644
--- a/ghc-regex-base.spec
+++ b/ghc-regex-base.spec
@@ -22,7 +22,7 @@ ExcludeArch:    %{ghc_excluded_archs}
 BuildRequires:  ghc-Cabal-devel
 BuildRequires:  ghc-rpm-macros
 BuildRequires:  hscolour
-BuildRequires:  ghc-mtl-prof
+BuildRequires:  ghc-mtl-prof, ghc-bytestring-prof
 
 %description
 %{common_description}