diff --git a/szutil_pruneplayers/init.lua b/szutil_pruneplayers/init.lua
index f90479f..9f89ca7 100644
--- a/szutil_pruneplayers/init.lua
+++ b/szutil_pruneplayers/init.lua
@@ -60,6 +60,12 @@ end
 
 ------------------------------------------------------------------------
 
+local lastauth = {}
+minetest.register_on_authplayer(function(name, _, is_success)
+		if not is_success then return end
+		lastauth[name] = os_time()
+	end)
+
 local function check(pname)
 	if protectnames[pname] or minetest.get_player_by_name(pname) then return end
 
@@ -69,10 +75,14 @@ local function check(pname)
 
 	if data.privileges[noprune] then return end
 
+	local seen = data.last_login
+	local authtime = lastauth[pname]
+	if authtime and authtime > seen then seen = authtime end
 	local now = os_time()
-	local daysago = (now - data.last_login) / 86400
+	local daysago = (now - seen) / 86400
 	if daysago <= maxdays then return end
 
+	lastauth[pname] = nil
 	minetest.log("warning", string_format(
 			"Deleting player %q last seen %0.1f day(s) ago",
 			pname, daysago))