diff --git a/mercurial.spec b/mercurial.spec
index dabf847..d287bd3 100644
--- a/mercurial.spec
+++ b/mercurial.spec
@@ -197,7 +197,7 @@ done
 popd
 
 pushd contrib/chg
-make install DESTDIR=%{buildroot} PREFIX=%{_usr} MANDIR=%{_mandir}/man1
+make install DESTDIR=%{buildroot} PREFIX=%{_prefix} MANDIR=%{_mandir}/man1
 popd