diff --git a/apps/openmw/mwmechanics/obstacle.cpp b/apps/openmw/mwmechanics/obstacle.cpp
index 9707ddb25..9562c74df 100644
--- a/apps/openmw/mwmechanics/obstacle.cpp
+++ b/apps/openmw/mwmechanics/obstacle.cpp
@@ -186,7 +186,7 @@ namespace MWMechanics
         }
     }
 
-    void ObstacleCheck::takeEvasiveAction(MWMechanics::Movement& actorMovement)
+    void ObstacleCheck::takeEvasiveAction(MWMechanics::Movement& actorMovement) const
     {
         actorMovement.mPosition[0] = evadeDirections[mEvadeDirectionIndex][0];
         actorMovement.mPosition[1] = evadeDirections[mEvadeDirectionIndex][1];
diff --git a/apps/openmw/mwmechanics/obstacle.hpp b/apps/openmw/mwmechanics/obstacle.hpp
index 1672e0b81..d7e582f8c 100644
--- a/apps/openmw/mwmechanics/obstacle.hpp
+++ b/apps/openmw/mwmechanics/obstacle.hpp
@@ -33,7 +33,7 @@ namespace MWMechanics
             void update(const MWWorld::Ptr& actor, float duration, float scaleMinimumDistance = 1.0f);
 
             // change direction to try to fix "stuck" actor
-            void takeEvasiveAction(MWMechanics::Movement& actorMovement);
+            void takeEvasiveAction(MWMechanics::Movement& actorMovement) const;
 
         private: