diff --git a/src/rendering/polyrenderer/backend/poly_buffers.cpp b/src/rendering/polyrenderer/backend/poly_buffers.cpp
index d99056b9c..392684532 100644
--- a/src/rendering/polyrenderer/backend/poly_buffers.cpp
+++ b/src/rendering/polyrenderer/backend/poly_buffers.cpp
@@ -65,6 +65,8 @@ void PolyBuffer::Unmap()
 
 void *PolyBuffer::Lock(unsigned int size)
 {
+	if (mData.size() < (size_t)size)
+		Resize(size);
 	return map;
 }