diff --git a/worlds/yoshisisland/Client.py b/worlds/yoshisisland/Client.py
index c512a831..1aff36c5 100644
--- a/worlds/yoshisisland/Client.py
+++ b/worlds/yoshisisland/Client.py
@@ -36,6 +36,7 @@ VALID_GAME_STATES = [0x0F, 0x10, 0x2C]
 
 class YoshisIslandSNIClient(SNIClient):
     game = "Yoshi's Island"
+    patch_suffix = ".apyi"
 
     async def deathlink_kill_player(self, ctx: "SNIContext") -> None:
         from SNIClient import DeathState, snes_buffered_write, snes_flush_writes, snes_read