diff --git a/proton b/proton
index 0b1c26ae..b03d515d 100755
--- a/proton
+++ b/proton
@@ -1045,6 +1045,12 @@ def default_compat_config():
         if appid == "1621680":
             ret.add("noforcelgadd")
 
+        if appid in [
+                "202990", #Call of Duty: Black Ops II - Multiplayer
+                "212910", #Call of Duty: Black Ops II - Zombies
+                ]:
+            ret.add("heapdelayfree")
+
     return ret
 
 class Session: