diff --git a/apps/openmw/mwbase/mechanicsmanager.hpp b/apps/openmw/mwbase/mechanicsmanager.hpp
index 87f1104db..e43d1fdc1 100644
--- a/apps/openmw/mwbase/mechanicsmanager.hpp
+++ b/apps/openmw/mwbase/mechanicsmanager.hpp
@@ -153,8 +153,7 @@ namespace MWBase
                 PT_Bribe100,
                 PT_Bribe1000
             };
-            virtual void getPersuasionDispositionChange (const MWWorld::Ptr& npc, PersuasionType type,
-                float currentTemporaryDispositionDelta, bool& success, float& tempChange, float& permChange) = 0;
+            virtual void getPersuasionDispositionChange (const MWWorld::Ptr& npc, PersuasionType type, bool& success, float& tempChange, float& permChange) = 0;
             ///< Perform a persuasion action on NPC
 
             virtual void forceStateUpdate(const MWWorld::Ptr &ptr) = 0;
diff --git a/apps/openmw/mwdialogue/dialoguemanagerimp.cpp b/apps/openmw/mwdialogue/dialoguemanagerimp.cpp
index 393d2dc98..4f0f4f469 100644
--- a/apps/openmw/mwdialogue/dialoguemanagerimp.cpp
+++ b/apps/openmw/mwdialogue/dialoguemanagerimp.cpp
@@ -529,7 +529,7 @@ namespace MWDialogue
         bool success;
         float temp, perm;
         MWBase::Environment::get().getMechanicsManager()->getPersuasionDispositionChange(
-                    mActor, MWBase::MechanicsManager::PersuasionType(type), mTemporaryDispositionChange,
+                    mActor, MWBase::MechanicsManager::PersuasionType(type),
                     success, temp, perm);
         mTemporaryDispositionChange += temp;
         mPermanentDispositionChange += perm;
diff --git a/apps/openmw/mwmechanics/mechanicsmanagerimp.cpp b/apps/openmw/mwmechanics/mechanicsmanagerimp.cpp
index 7cfb937c8..d02fce94e 100644
--- a/apps/openmw/mwmechanics/mechanicsmanagerimp.cpp
+++ b/apps/openmw/mwmechanics/mechanicsmanagerimp.cpp
@@ -702,8 +702,7 @@ namespace MWMechanics
         return mActors.countDeaths (id);
     }
 
-    void MechanicsManager::getPersuasionDispositionChange (const MWWorld::Ptr& npc, PersuasionType type,
-        float currentTemporaryDispositionDelta, bool& success, float& tempChange, float& permChange)
+    void MechanicsManager::getPersuasionDispositionChange (const MWWorld::Ptr& npc, PersuasionType type, bool& success, float& tempChange, float& permChange)
     {
         const MWWorld::Store<ESM::GameSetting> &gmst =
             MWBase::Environment::get().getWorld()->getStore().get<ESM::GameSetting>();
@@ -719,7 +718,7 @@ namespace MWMechanics
         float playerRating1, playerRating2, playerRating3;
         getPersuasionRatings(playerStats, playerRating1, playerRating2, playerRating3, true);
 
-        int currentDisposition = std::min(100, std::max(0, int(getDerivedDisposition(npc, false) + currentTemporaryDispositionDelta)));
+        int currentDisposition = getDerivedDisposition(npc);
 
         float d = 1 - 0.02f * abs(currentDisposition - 50);
         float target1 = d * (playerRating1 - npcRating1 + 50);
diff --git a/apps/openmw/mwmechanics/mechanicsmanagerimp.hpp b/apps/openmw/mwmechanics/mechanicsmanagerimp.hpp
index c61dce521..5acff50a4 100644
--- a/apps/openmw/mwmechanics/mechanicsmanagerimp.hpp
+++ b/apps/openmw/mwmechanics/mechanicsmanagerimp.hpp
@@ -98,8 +98,7 @@ namespace MWMechanics
             virtual int countDeaths (const std::string& id) const;
             ///< Return the number of deaths for actors with the given ID.
 
-            virtual void getPersuasionDispositionChange (const MWWorld::Ptr& npc, PersuasionType type,
-                float currentTemporaryDispositionDelta, bool& success, float& tempChange, float& permChange);
+            virtual void getPersuasionDispositionChange (const MWWorld::Ptr& npc, PersuasionType type, bool& success, float& tempChange, float& permChange);
             void toLower(std::string npcFaction);
             ///< Perform a persuasion action on NPC