diff --git a/ghc-utf8-string.spec b/ghc-utf8-string.spec
index 4de88de..43672bc 100644
--- a/ghc-utf8-string.spec
+++ b/ghc-utf8-string.spec
@@ -20,6 +20,7 @@ ExcludeArch:    %{ghc_excluded_archs}
 BuildRequires:  ghc-Cabal-devel
 BuildRequires:  ghc-rpm-macros
 BuildRequires:  hscolour
+BuildRequires:  ghc-bytestring-prof
 
 %description
 %{common_description}