diff --git a/ghc-rpm-macros.ghc b/ghc-rpm-macros.ghc
index ff555d9..0e94ec6 100644
--- a/ghc-rpm-macros.ghc
+++ b/ghc-rpm-macros.ghc
@@ -24,7 +24,7 @@ fi
 if ! grep -q "%1[ >=].*%2"; then\
    exit 1\
 fi\
-sed -i.%{?3}%{!?3:%1} -e "s/\(%1[ >=].*\)%2/\1%3/g" %{pkg_name}-%{version}/%{pkg_name}.cabal
+sed -i.%{?3}%1 -e "s/\(%1[ >=].*\)%2/\1%3/g" %{pkg_name}-%{version}/%{pkg_name}.cabal
 
 # configure
 %cabal_configure\