diff --git a/redis/base.cfg b/redis/base.cfg
index 282be83..920948d 100644
--- a/redis/base.cfg
+++ b/redis/base.cfg
@@ -40,8 +40,8 @@ destination = ${buildout:parts-directory}/redis-${redis-settings:redis-version}
 [redis-build]
 recipe = collective.recipe.cmd
 on_install = true
-on_update = false
-cmds = cd ${redis-download:location} && make
+on_update = true
+cmds = cd ${redis-download:location} ; if [ ! -e "src/redis-server" ]; then make; fi
 
 
 [redis-ensure-var-exists]