diff --git a/apps/openmw/mwworld/physicssystem.cpp b/apps/openmw/mwworld/physicssystem.cpp
index 8aca591e8e..ad4300b1f5 100644
--- a/apps/openmw/mwworld/physicssystem.cpp
+++ b/apps/openmw/mwworld/physicssystem.cpp
@@ -743,7 +743,8 @@ namespace MWWorld
 
                 // TODO: this seems to have a slight performance impact
                 if (waterCollision)
-                    mEngine->mDynamicsWorld->addCollisionObject(&object);
+                    mEngine->mDynamicsWorld->addCollisionObject(&object,
+                                                                0xff, OEngine::Physic::CollisionType_Actor);
 
                 // 100 points of slowfall reduce gravity by 90% (this is just a guess)
                 float slowFall = 1-std::min(std::max(0.f, (effects.get(ESM::MagicEffect::SlowFall).mMagnitude / 100.f) * 0.9f), 0.9f);
diff --git a/libs/openengine/bullet/physic.hpp b/libs/openengine/bullet/physic.hpp
index f24ef93d0e..deef214431 100644
--- a/libs/openengine/bullet/physic.hpp
+++ b/libs/openengine/bullet/physic.hpp
@@ -82,10 +82,7 @@ namespace Physic
         bool mPlaceable;
     };
 
-    /**
-     * A physic actor uses a rigid body based on box shapes.
-     * Pmove is used to move the physic actor around the dynamic world.
-     */
+
     class PhysicActor
     {
     public: