diff --git a/src/gl/data/gl_vertexbuffer.cpp b/src/gl/data/gl_vertexbuffer.cpp
index 71bac435c..b18b367c3 100644
--- a/src/gl/data/gl_vertexbuffer.cpp
+++ b/src/gl/data/gl_vertexbuffer.cpp
@@ -213,6 +213,17 @@ FFlatVertexBuffer::~FFlatVertexBuffer()
 	map = nullptr;
 }
 
+void FFlatVertexBuffer::OutputResized(int width, int height)
+{
+	vbo_shadowdata[4].Set(0, 0, 0, 0, 0);
+	vbo_shadowdata[5].Set(0, (float)height, 0, 0, 0);
+	vbo_shadowdata[6].Set((float)width, 0, 0, 0, 0);
+	vbo_shadowdata[7].Set((float)width, (float)height, 0, 0, 0);
+	
+	Map();
+	memcpy(map, &vbo_shadowdata[4], 4 * sizeof(FFlatVertex));
+	Unmap();
+}
 
 void FFlatVertexBuffer::BindVBO()
 {
diff --git a/src/gl/data/gl_vertexbuffer.h b/src/gl/data/gl_vertexbuffer.h
index 1e9692f48..596de35d9 100644
--- a/src/gl/data/gl_vertexbuffer.h
+++ b/src/gl/data/gl_vertexbuffer.h
@@ -131,6 +131,8 @@ public:
 	FFlatVertexBuffer(int width, int height);
 	~FFlatVertexBuffer();
 
+	void OutputResized(int width, int height);
+
 	void BindVBO();
 
 	void CreateVBO();
diff --git a/src/gl/system/gl_framebuffer.cpp b/src/gl/system/gl_framebuffer.cpp
index a61d139c0..07d8abaef 100644
--- a/src/gl/system/gl_framebuffer.cpp
+++ b/src/gl/system/gl_framebuffer.cpp
@@ -192,6 +192,7 @@ void OpenGLFrameBuffer::Update()
 		{
 			Resize(clientWidth, clientHeight);
 			V_OutputResized(Width, Height);
+			GLRenderer->mVBO->OutputResized(Width, Height);
 		}
 	}