diff --git a/xmobar.spec b/xmobar.spec
index 75f3755..5b612ba 100644
--- a/xmobar.spec
+++ b/xmobar.spec
@@ -27,6 +27,7 @@ BuildRequires:  ghc-mtl-devel
 BuildRequires:  ghc-old-locale-devel
 BuildRequires:  ghc-parsec-devel
 BuildRequires:  ghc-process-devel
+BuildRequires:  ghc-regex-compat-devel
 BuildRequires:  ghc-stm-devel
 BuildRequires:  ghc-time-devel
 BuildRequires:  ghc-unix-devel