diff --git a/site-cookbooks/kosmos_postgresql/resources/server.rb b/site-cookbooks/kosmos_postgresql/resources/server.rb
index e024f78..f08a70d 100644
--- a/site-cookbooks/kosmos_postgresql/resources/server.rb
+++ b/site-cookbooks/kosmos_postgresql/resources/server.rb
@@ -56,7 +56,7 @@ action :create do
     timezone: "UTC", # default is GMT
     listen_addresses: "0.0.0.0",
     promote_trigger_file: "#{postgresql_data_dir}/failover.trigger",
-    wal_keep_segments: 256
+    wal_keep_size: 4096 # 256 segments, 16MB each
   }
 
   postgresql_server_conf "main" do