diff --git a/apps/openmw/mwgui/trainingwindow.cpp b/apps/openmw/mwgui/trainingwindow.cpp
index ad925bbff..630ba8ce1 100644
--- a/apps/openmw/mwgui/trainingwindow.cpp
+++ b/apps/openmw/mwgui/trainingwindow.cpp
@@ -143,7 +143,7 @@ namespace MWGui
             return;
 
         MWMechanics::NpcStats& npcStats = mPtr.getClass().getNpcStats (mPtr);
-        if (npcStats.getSkill (skillId).getBase () <= pcStats.getSkill (skillId).getBase ())
+        if (npcStats.getSkill (skillId).getModified () <= pcStats.getSkill (skillId).getBase ())
         {
             MWBase::Environment::get().getWindowManager()->messageBox ("#{sServiceTrainingWords}");
             return;