diff --git a/wadsrc/static/compatibility.txt b/wadsrc/static/compatibility.txt
index 09f38a80b..98528363d 100644
--- a/wadsrc/static/compatibility.txt
+++ b/wadsrc/static/compatibility.txt
@@ -21,6 +21,7 @@ A80E7EE40E0D0C76A6FBD242BE29FE27 // map15
 2F1F8E27FBB5EF21AFBE1F3B13C03037 // map16
 1CE294781A2455DE72C197E0B3DF6212 // map31
 {
+	setslopeoverflow
 	resetplayerspeed
 }