diff --git a/apps/openmw/mwrender/debugging.cpp b/apps/openmw/mwrender/debugging.cpp
index 91b217a36..71366307a 100644
--- a/apps/openmw/mwrender/debugging.cpp
+++ b/apps/openmw/mwrender/debugging.cpp
@@ -19,6 +19,7 @@
 #include "../mwworld/ptr.hpp"
 
 #include "player.hpp"
+#include "renderconst.hpp"
 
 using namespace Ogre;
 
@@ -86,6 +87,8 @@ ManualObject *Debugging::createPathgridLines(const ESM::Pathgrid *pathgrid)
     }
     result->end();
 
+    result->setVisibilityFlags (RV_Debug);
+
     return result;
 }
 
@@ -140,6 +143,8 @@ ManualObject *Debugging::createPathgridPoints(const ESM::Pathgrid *pathgrid)
 
     result->end();
 
+    result->setVisibilityFlags (RV_Debug);
+
     return result;
 }
 
diff --git a/apps/openmw/mwrender/renderconst.hpp b/apps/openmw/mwrender/renderconst.hpp
index e6ecb5150..75e243ec7 100644
--- a/apps/openmw/mwrender/renderconst.hpp
+++ b/apps/openmw/mwrender/renderconst.hpp
@@ -56,9 +56,9 @@ enum VisibilityFlags
 
     RV_PlayerPreview = 512,
 
-    RV_Map = RV_Terrain + RV_Statics + RV_StaticsSmall + RV_Misc + RV_Water
+    RV_Debug = 1024,
 
-    /// \todo markers (normally hidden)
+    RV_Map = RV_Terrain + RV_Statics + RV_StaticsSmall + RV_Misc + RV_Water
 };
 
 }
diff --git a/libs/openengine/bullet/BtOgreExtras.h b/libs/openengine/bullet/BtOgreExtras.h
index f3e1aa87a..423924eda 100644
--- a/libs/openengine/bullet/BtOgreExtras.h
+++ b/libs/openengine/bullet/BtOgreExtras.h
@@ -206,6 +206,8 @@ public:
                 }
 
         mLineDrawer->setMaterial("BtOgre/DebugLines");
+
+        mLineDrawer->setVisibilityFlags (1024);
     }
 
     ~DebugDrawer()