diff --git a/src/rendering/hwrenderer/dynlights/hw_lightbuffer.h b/src/rendering/hwrenderer/dynlights/hw_lightbuffer.h
index 9522ccc45..1db32f646 100644
--- a/src/rendering/hwrenderer/dynlights/hw_lightbuffer.h
+++ b/src/rendering/hwrenderer/dynlights/hw_lightbuffer.h
@@ -59,6 +59,7 @@ public:
 	void BindBase()
 	{
 		mBuffer->BindBase();
+		mLastMappedIndex = UINT_MAX;
 	}
 
 };