diff --git a/apps/openmw/mwrender/bulletdebugdraw.cpp b/apps/openmw/mwrender/bulletdebugdraw.cpp
index c6d7935c5..eaf36cf85 100644
--- a/apps/openmw/mwrender/bulletdebugdraw.cpp
+++ b/apps/openmw/mwrender/bulletdebugdraw.cpp
@@ -78,6 +78,7 @@ void DebugDrawer::step()
         mWorld->debugDrawWorld();
         mDrawArrays->setCount(mVertices->size());
         mVertices->dirty();
+        mGeometry->dirtyBound();
     }
 }