diff --git a/proton b/proton
index e0131bb2d8..d1ba5c7891 100755
--- a/proton
+++ b/proton
@@ -1188,6 +1188,11 @@ def default_compat_config():
                 ]:
             ret.add("heapzeromemory")
 
+        if appid in [
+                "71230", #Crazy Taxi
+                ]:
+            ret.add("heaptopdown")
+
         if appid in [
                 "2630", #Call of Duty 2
                 "1060210", #Disaster Report 4: Summer Memories
@@ -1487,6 +1492,9 @@ class Session:
         if "heapzeromemory" in self.compat_config:
             self.env["WINE_HEAP_ZERO_MEMORY"] = "1"
 
+        if "heaptopdown" in self.compat_config:
+            self.env["WINE_HEAP_TOP_DOWN"] = "1"
+
         if "vkd3dbindlesstb" in self.compat_config:
             append_to_env_str(self.env, "VKD3D_CONFIG", "force_bindless_texel_buffer", ",")