diff --git a/apps/openmw/mwphysics/physicssystem.cpp b/apps/openmw/mwphysics/physicssystem.cpp
index 04b53a8e38..db34e04117 100644
--- a/apps/openmw/mwphysics/physicssystem.cpp
+++ b/apps/openmw/mwphysics/physicssystem.cpp
@@ -176,7 +176,8 @@ namespace MWPhysics
 
         static inline osg::Vec3f reflect(const osg::Vec3& velocity, const osg::Vec3f& normal)
         {
-            return (normal * (normal * velocity)) * 2 - velocity;
+            return velocity - (normal * (normal * velocity)) * 2;
+            //                                  ^ dot product
         }