diff --git a/include/config/overworld.h b/include/config/overworld.h
index e8056236a..4fb7e7bd0 100644
--- a/include/config/overworld.h
+++ b/include/config/overworld.h
@@ -5,7 +5,7 @@
 #define OW_RUNNING_INDOORS          GEN_LATEST  // In Gen4+, players are allowed to run indoors.
 
 // Other settings
-#define OW_POISON_DAMAGE            GEN_LATEST // In Gen4, Pokémon no longer faint from Poison in the overworld. In Gen5+, they no longer take damage at all.
+#define OW_POISON_DAMAGE            GEN_4 // In Gen4, Pokémon no longer faint from Poison in the overworld. In Gen5+, they no longer take damage at all.
 
 // PC settings
 #define OW_PC_PRESS_B               GEN_LATEST // In Gen4, pressing B when holding a Pokémon is equivalent to placing it. In Gen3, it gives the "You're holding a Pokémon!" error.