diff --git a/apps/openmw/mwbase/world.hpp b/apps/openmw/mwbase/world.hpp
index ba48aa910..27b071f96 100644
--- a/apps/openmw/mwbase/world.hpp
+++ b/apps/openmw/mwbase/world.hpp
@@ -481,7 +481,7 @@ namespace MWBase
             virtual void launchMagicBolt (const std::string& model, const std::string& sound, const std::string& spellId,
                                           float speed, bool stack, const ESM::EffectList& effects,
                                            const MWWorld::Ptr& caster, const std::string& sourceName, const osg::Vec3f& fallbackDirection) = 0;
-            virtual void launchProjectile (MWWorld::Ptr actor, MWWorld::Ptr projectile,
+            virtual void launchProjectile (MWWorld::Ptr actor, MWWorld::ConstPtr projectile,
                                            const osg::Vec3f& worldPos, const osg::Quat& orient, MWWorld::Ptr bow, float speed, float attackStrength) = 0;
 
             virtual const std::vector<std::string>& getContentFiles() const = 0;
diff --git a/apps/openmw/mwworld/projectilemanager.cpp b/apps/openmw/mwworld/projectilemanager.cpp
index 5728fe1d7..439ac19ec 100644
--- a/apps/openmw/mwworld/projectilemanager.cpp
+++ b/apps/openmw/mwworld/projectilemanager.cpp
@@ -161,7 +161,7 @@ namespace MWWorld
         mMagicBolts.push_back(state);
     }
 
-    void ProjectileManager::launchProjectile(Ptr actor, Ptr projectile, const osg::Vec3f &pos, const osg::Quat &orient, Ptr bow, float speed, float attackStrength)
+    void ProjectileManager::launchProjectile(Ptr actor, ConstPtr projectile, const osg::Vec3f &pos, const osg::Quat &orient, Ptr bow, float speed, float attackStrength)
     {
         ProjectileState state;
         state.mActorId = actor.getClass().getCreatureStats(actor).getActorId();
diff --git a/apps/openmw/mwworld/projectilemanager.hpp b/apps/openmw/mwworld/projectilemanager.hpp
index f58e266b3..74d4c1dc5 100644
--- a/apps/openmw/mwworld/projectilemanager.hpp
+++ b/apps/openmw/mwworld/projectilemanager.hpp
@@ -53,7 +53,7 @@ namespace MWWorld
                                      float speed, bool stack, const ESM::EffectList& effects,
                                        const MWWorld::Ptr& caster, const std::string& sourceName, const osg::Vec3f& fallbackDirection);
 
-        void launchProjectile (MWWorld::Ptr actor, MWWorld::Ptr projectile,
+        void launchProjectile (MWWorld::Ptr actor, MWWorld::ConstPtr projectile,
                                        const osg::Vec3f& pos, const osg::Quat& orient, MWWorld::Ptr bow, float speed, float attackStrength);
 
         void update(float dt);
diff --git a/apps/openmw/mwworld/worldimp.cpp b/apps/openmw/mwworld/worldimp.cpp
index 56fe2fc3d..3f13f2faf 100644
--- a/apps/openmw/mwworld/worldimp.cpp
+++ b/apps/openmw/mwworld/worldimp.cpp
@@ -2712,7 +2712,7 @@ namespace MWWorld
         }
     }
 
-    void World::launchProjectile (MWWorld::Ptr actor, MWWorld::Ptr projectile,
+    void World::launchProjectile (MWWorld::Ptr actor, MWWorld::ConstPtr projectile,
                                    const osg::Vec3f& worldPos, const osg::Quat& orient, MWWorld::Ptr bow, float speed, float attackStrength)
     {
         mProjectileManager->launchProjectile(actor, projectile, worldPos, orient, bow, speed, attackStrength);
diff --git a/apps/openmw/mwworld/worldimp.hpp b/apps/openmw/mwworld/worldimp.hpp
index 7d67395cf..46f245a12 100644
--- a/apps/openmw/mwworld/worldimp.hpp
+++ b/apps/openmw/mwworld/worldimp.hpp
@@ -586,7 +586,7 @@ namespace MWWorld
             virtual void launchMagicBolt (const std::string& model, const std::string& sound, const std::string& spellId,
                                           float speed, bool stack, const ESM::EffectList& effects,
                                            const MWWorld::Ptr& caster, const std::string& sourceName, const osg::Vec3f& fallbackDirection);
-            virtual void launchProjectile (MWWorld::Ptr actor, MWWorld::Ptr projectile,
+            virtual void launchProjectile (MWWorld::Ptr actor, MWWorld::ConstPtr projectile,
                                            const osg::Vec3f& worldPos, const osg::Quat& orient, MWWorld::Ptr bow, float speed, float attackStrength);