diff --git a/old-time.cabal b/old-time.cabal
index 389b4779ec3bf0eff6c361110a68a66087a4c3a5..594bf74505de5481b13b29b6d161626cf9c18b84 100644
--- a/old-time.cabal
+++ b/old-time.cabal
@@ -15,5 +15,5 @@ include-dirs: include
 includes:	HsTime.h
 install-includes:	HsTime.h
 extensions:	CPP, ForeignFunctionInterface
-build-depends: base
+build-depends: base, old-locale