diff --git a/ghc-old-locale.spec b/ghc-old-locale.spec
index 2a63c67..142edb5 100644
--- a/ghc-old-locale.spec
+++ b/ghc-old-locale.spec
@@ -33,6 +33,7 @@ This package provides the Haskell %{pkg_name} library development files.
 
 %prep
 %setup -q -n %{pkg_name}-%{version}
+cabal-tweak-dep-ver base '< 4.9' '< 4.10'
 
 
 %build