diff --git a/hlint.spec b/hlint.spec
index a654540..b65d390 100644
--- a/hlint.spec
+++ b/hlint.spec
@@ -56,6 +56,8 @@ BuildRequires:  ghc-pretty-prof
 BuildRequires:  ghc-time-prof
 BuildRequires:  ghc-unix-prof
 # End cabal-rpm deps
+# for ghc-lib-parser
+BuildRequires:  alex
 
 %description
 HLint gives suggestions on how to improve your source code.