diff --git a/src/pokemon.c b/src/pokemon.c
index 9f8c7211f9..e7db64cd9a 100644
--- a/src/pokemon.c
+++ b/src/pokemon.c
@@ -2537,6 +2537,7 @@ u32 GetBoxMonData3(struct BoxPokemon *boxMon, s32 field, u8 *data)
         case MON_DATA_EVOLUTION_TRACKER:
             evoTracker.asField.a = substruct1->evolutionTracker1;
             evoTracker.asField.b = substruct1->evolutionTracker2;
+            evoTracker.asField.unused = 0;
             retVal = evoTracker.value;
             break;
         default: