diff --git a/proton b/proton
index 3434b5cd..b4c6357c 100755
--- a/proton
+++ b/proton
@@ -1110,6 +1110,7 @@ def default_compat_config():
             ret.add("heapdelayfree")
 
         if appid in [
+                "21980", #Call of Juarez: Bound in Blood
                 "553850", #Helldivers 2
                 ]:
             ret.add("heapzeromemory")