diff --git a/apps/openmw/mwbase/world.hpp b/apps/openmw/mwbase/world.hpp
index c2a7de72b2..119ce6b217 100644
--- a/apps/openmw/mwbase/world.hpp
+++ b/apps/openmw/mwbase/world.hpp
@@ -489,7 +489,7 @@ namespace MWBase
             // Are we in an exterior or pseudo-exterior cell and it's night?
             virtual bool isDark() const = 0;
 
-            virtual bool findInteriorPositionInWorldSpace(MWWorld::CellStore* cell, osg::Vec3f& result) = 0;
+            virtual bool findInteriorPositionInWorldSpace(const MWWorld::CellStore* cell, osg::Vec3f& result) = 0;
 
             /// Teleports \a ptr to the closest reference of \a id (e.g. DivineMarker, PrisonMarker, TempleMarker)
             /// @note id must be lower case
diff --git a/apps/openmw/mwworld/worldimp.cpp b/apps/openmw/mwworld/worldimp.cpp
index a556aabf7c..9064dc94cd 100644
--- a/apps/openmw/mwworld/worldimp.cpp
+++ b/apps/openmw/mwworld/worldimp.cpp
@@ -2654,7 +2654,7 @@ namespace MWWorld
         }
     }
 
-    bool World::findInteriorPositionInWorldSpace(MWWorld::CellStore* cell, osg::Vec3f& result)
+    bool World::findInteriorPositionInWorldSpace(const MWWorld::CellStore* cell, osg::Vec3f& result)
     {
         if (cell->isExterior())
             return false;
diff --git a/apps/openmw/mwworld/worldimp.hpp b/apps/openmw/mwworld/worldimp.hpp
index 487d4ed04d..8c56443f79 100644
--- a/apps/openmw/mwworld/worldimp.hpp
+++ b/apps/openmw/mwworld/worldimp.hpp
@@ -592,7 +592,7 @@ namespace MWWorld
             // Are we in an exterior or pseudo-exterior cell and it's night?
             virtual bool isDark() const;
 
-            virtual bool findInteriorPositionInWorldSpace(MWWorld::CellStore* cell, osg::Vec3f& result);
+            virtual bool findInteriorPositionInWorldSpace(const MWWorld::CellStore* cell, osg::Vec3f& result);
 
             /// Teleports \a ptr to the closest reference of \a id (e.g. DivineMarker, PrisonMarker, TempleMarker)
             /// @note id must be lower case