diff --git a/src/field/pokemon.ts b/src/field/pokemon.ts
index 753a139d60f..7e1431c1fa2 100644
--- a/src/field/pokemon.ts
+++ b/src/field/pokemon.ts
@@ -3972,7 +3972,8 @@ export class PlayerPokemon extends Pokemon {
       let compatible = false;
       for (const p of tmSpecies[tm]) {
         if (Array.isArray(p)) {
-          if ((p[0] === this.species.speciesId || this.fusionSpecies && p[0] === this.fusionSpecies.speciesId) && p.slice(1).indexOf(this.species.forms[this.formIndex]) > -1) {
+          const [pkm, ...forms] = p;
+          if ((pkm === this.species.speciesId || this.fusionSpecies && pkm === this.fusionSpecies.speciesId) && forms.some(form => form === this.species.forms[this.formIndex])) {
             compatible = true;
             break;
           }