diff --git a/libs/gfx/include/psemek/gfx/buffer.hpp b/libs/gfx/include/psemek/gfx/buffer.hpp
index 400f0fe2..41f49a4f 100644
--- a/libs/gfx/include/psemek/gfx/buffer.hpp
+++ b/libs/gfx/include/psemek/gfx/buffer.hpp
@@ -160,7 +160,7 @@ namespace psemek::gfx
 				return std::static_pointer_cast<T[]>(p);
 
 			bind();
-			std::shared_ptr<T[]> p(reinterpret_cast<T *>(gl::MapBufferRange(Target, 0, size_, gl::WRITE_ONLY)), [this](T *){
+			std::shared_ptr<T[]> p(reinterpret_cast<T *>(gl::MapBufferRange(Target, 0, size_, gl::MAP_WRITE_BIT)), [this](T *){
 				bind();
 				gl::UnmapBuffer(Target);
 			});