diff --git a/wadsrc/static/compatibility.txt b/wadsrc/static/compatibility.txt
index e534146ef66..691cbabebf5 100644
--- a/wadsrc/static/compatibility.txt
+++ b/wadsrc/static/compatibility.txt
@@ -254,6 +254,7 @@ C98F79709BD7E0E4C19026AB9575EC6F // cc-cod.zip:codlev.wad map07
 D7F6E9F08C39A17026349A04F8C0B0BE // Return to Hadron, e1m9
 19D03FFC875589E21EDBB7AB74EF4AEF // Return to Hadron, e1m9, 2016.01.03 update
 5BDA34DA60C0530794CC1EA2DA017976 // doom2.wad map14
+5B3F118B337BFBFB8D5C81E98AF7B71D // Ancient Aliens map23
 {
 	pointonline
 }