diff --git a/src/data/ability.ts b/src/data/ability.ts
index 038d2c2c1f8..0b2ba2c5991 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -4714,8 +4714,10 @@ export class TerrainEventTypeChangeAbAttr extends PostSummonAbAttr {
         break;
       }
     }
-    pokemon.summonData.types = typeChange;
-    pokemon.updateInfo();
+    if (typeChange.length !== 0) {
+      pokemon.summonData.types = typeChange;
+      pokemon.updateInfo();
+    }
     return true;
   }
 }