diff --git a/src/system/game-data.ts b/src/system/game-data.ts
index 91eb66d6d48..f9f4d060cf3 100644
--- a/src/system/game-data.ts
+++ b/src/system/game-data.ts
@@ -1586,7 +1586,7 @@ export class GameData {
     // If incrementCount === false (not a catch scenario), only update the pokemon's dex data if the Pokemon has already been marked as caught in dex
     // Prevents form changes, nature changes, etc. from unintentionally updating the dex data of a "rental" pokemon
     const speciesRootForm = pokemon.species.getRootSpeciesId();
-    if (!!this.scene.gameData.dexData[speciesRootForm].caughtAttr) {
+    if (this.scene.gameData.dexData[speciesRootForm].caughtAttr) {
       return this.setPokemonSpeciesCaught(pokemon, pokemon.species, incrementCount, fromEgg, showMessage);
     } else {
       return new Promise(resolve => resolve(false));