diff --git a/salt/profile/postgresql/files/postgresql/postgresql.conf b/salt/profile/postgresql/files/postgresql/postgresql.conf
index 54ede76..3b3127d 100644
--- a/salt/profile/postgresql/files/postgresql/postgresql.conf
+++ b/salt/profile/postgresql/files/postgresql/postgresql.conf
@@ -221,7 +221,8 @@ synchronous_commit = off
 
 #checkpoint_timeout = 5min		# range 30s-1d
 checkpoint_timeout = 15min
-max_wal_size = 1GB
+# wal needs to be large enough for mirrordb2 replication to catch up after reboot
+max_wal_size = 20GB
 min_wal_size = 80MB
 checkpoint_completion_target = 0.9	# checkpoint target duration, 0.0 - 1.0
 #checkpoint_flush_after = 256kB		# measured in pages, 0 disables