diff --git a/ghc-network-bsd.spec b/ghc-network-bsd.spec
index 516b66f..9533c02 100644
--- a/ghc-network-bsd.spec
+++ b/ghc-network-bsd.spec
@@ -80,6 +80,7 @@ This package provides the Haskell %{pkg_name} library development files.
 %prep
 %setup -q -n %{pkg_name}-%{version}
 cp -p %{SOURCE1} %{pkg_name}.cabal
+sed -i -e 's/< 3.1.2/< 4/' network-bsd.cabal
 
 %build
 %ghc_lib_build