diff --git a/src/party_menu.c b/src/party_menu.c
index ba8eb47fc4..348b0ef8ea 100755
--- a/src/party_menu.c
+++ b/src/party_menu.c
@@ -1962,7 +1962,7 @@ static u8 CanMonLearnTMTutor(struct Pokemon *mon, u16 item, u8 tutor)
 
     if (item >= ITEM_TM01)
     {
-        if (!CanMonLearnTMHM(mon, item - ITEM_TM01 - ((item > ITEM_TM100) ? 50 : 0)))
+        if (!CanMonLearnTMHM(mon, item - ITEM_TM01 - ((item > ITEM_TM100) ? NUM_TECHNICAL_MACHINES : 0)))
             return CANNOT_LEARN_MOVE;
         else
             move = ItemIdToBattleMoveId(item);