diff --git a/worlds/mmx/Client.py b/worlds/mmx/Client.py
index 079721ce341a..3c5094fd2567 100644
--- a/worlds/mmx/Client.py
+++ b/worlds/mmx/Client.py
@@ -74,6 +74,7 @@
 
 class MMXSNIClient(SNIClient):
     game = "Mega Man X"
+    patch_suffix = ".apmmx"
 
     def __init__(self):
         super().__init__()