diff --git a/include/constants/pokemon.h b/include/constants/pokemon.h
index 5579102f5b..94a2adfcd8 100644
--- a/include/constants/pokemon.h
+++ b/include/constants/pokemon.h
@@ -374,4 +374,6 @@
 
 #define MON_PIC_SIZE (64 * 64 / 2)
 
+#define NUM_ABILITY_SLOTS 2
+
 #endif // GUARD_CONSTANTS_POKEMON_H
diff --git a/include/pokemon.h b/include/pokemon.h
index 67672fb113..696040fd62 100644
--- a/include/pokemon.h
+++ b/include/pokemon.h
@@ -201,10 +201,7 @@ struct BaseStats
  /* 0x13 */ u8 growthRate;
  /* 0x14 */ u8 eggGroup1;
  /* 0x15 */ u8 eggGroup2;
- /* 0x16 */ u16 abilities[2];
-#ifdef POKEMON_EXPANSION
-            u16 abilityHidden;
-#endif
+ /* 0x16 */ u16 abilities[NUM_ABILITY_SLOTS];
             u8 safariZoneFleeRate;
             u8 bodyColor : 7;
             u8 noFlip : 1;