diff --git a/source/glbackend/glbackend.cpp b/source/glbackend/glbackend.cpp
index 1e2ee04ac..f8d19af10 100644
--- a/source/glbackend/glbackend.cpp
+++ b/source/glbackend/glbackend.cpp
@@ -427,6 +427,8 @@ void videoShowFrame(int32_t w)
 		});
 	screen->Update();
 	screen->mVertexData->Reset();
+	screen->mViewpoints->Clear();
+
 	videoSetBrightness(0);	// immediately reset this after rendering so that the value doesn't stick around in the backend.
 
 							// After finishing the frame, reset everything for the next frame. This needs to be done better.