diff --git a/src/common/rendering/hwrenderer/data/hw_levelmeshportal.h b/src/common/rendering/hwrenderer/data/hw_levelmeshportal.h
index 9e45aa6e3..c7f4c4fc9 100644
--- a/src/common/rendering/hwrenderer/data/hw_levelmeshportal.h
+++ b/src/common/rendering/hwrenderer/data/hw_levelmeshportal.h
@@ -1,6 +1,7 @@
 
 #pragma once
 
+#include <cstring>
 #include "vectors.h"
 #include "common/utility/matrix.h"
 
diff --git a/src/rendering/hwrenderer/scene/hw_drawstructs.h b/src/rendering/hwrenderer/scene/hw_drawstructs.h
index 351c5dad6..198b8f18c 100644
--- a/src/rendering/hwrenderer/scene/hw_drawstructs.h
+++ b/src/rendering/hwrenderer/scene/hw_drawstructs.h
@@ -32,7 +32,7 @@ struct HWDecal;
 struct FSection;
 enum area_t : int;
 class HWDrawContext;
-class DoomLevelMeshSurface;
+struct DoomLevelMeshSurface;
 struct HWFlatDispatcher;
 
 enum HWRenderStyle