diff --git a/apps/openmw/mwmechanics/npcstats.cpp b/apps/openmw/mwmechanics/npcstats.cpp
index 08ac123748..d2908e26e2 100644
--- a/apps/openmw/mwmechanics/npcstats.cpp
+++ b/apps/openmw/mwmechanics/npcstats.cpp
@@ -1,6 +1,7 @@
 
 #include "npcstats.hpp"
 
+#include <cmath>
 #include <stdexcept>
 
 #include <components/esm/loadskil.hpp>
@@ -123,3 +124,17 @@ float MWMechanics::NpcStats::getSkillGain (int skillIndex, const ESM::Class& cla
 
     return 1.0 / (level +1) * (1.0 / skillFactor) * typeFactor * specialisationFactor;
 }
+
+void MWMechanics::NpcStats::useSkill (int skillIndex, const ESM::Class& class_, int usageType)
+{
+    float base = getSkill (skillIndex).getBase();
+
+    int level = static_cast<int> (base);
+
+    base += getSkillGain (skillIndex, class_, usageType);
+
+    if (static_cast<int> (base)!=level)
+        base = level+1;
+
+    getSkill (skillIndex).setBase (base);
+}
diff --git a/apps/openmw/mwmechanics/npcstats.hpp b/apps/openmw/mwmechanics/npcstats.hpp
index 1dccdd0d60..364dab03fa 100644
--- a/apps/openmw/mwmechanics/npcstats.hpp
+++ b/apps/openmw/mwmechanics/npcstats.hpp
@@ -70,6 +70,9 @@ namespace MWMechanics
             ///< \param usageType: Usage specific factor, specified in the respective skill record;
             /// -1: use a factor of 1.0 instead.
             /// \param level Level to base calculation on; -1: use current level.
+
+            void useSkill (int skillIndex, const ESM::Class& class_, int usageType = -1);
+            ///< Increase skill by usage.
     };
 }