diff --git a/src/renderer_d3d9.cpp b/src/renderer_d3d9.cpp
index 2fa8fbc1..6cc8ad7e 100644
--- a/src/renderer_d3d9.cpp
+++ b/src/renderer_d3d9.cpp
@@ -1845,8 +1845,8 @@ namespace bgfx
 	void TextVideoMemBlitter::render(uint32_t _numIndices)
 	{
 		uint32_t numVertices = _numIndices*4/6;
-		s_renderCtx.m_indexBuffers[m_ib->handle.idx].update(0, _numIndices*2, m_ib->data);
-		s_renderCtx.m_vertexBuffers[m_vb->handle.idx].update(0, numVertices*m_decl.m_stride, m_vb->data);
+		s_renderCtx.m_indexBuffers[m_ib->handle.idx].update(0, _numIndices*2, m_ib->data, true);
+		s_renderCtx.m_vertexBuffers[m_vb->handle.idx].update(0, numVertices*m_decl.m_stride, m_vb->data, true);
 
 		DX_CHECK(s_renderCtx.m_device->DrawIndexedPrimitive(D3DPT_TRIANGLELIST
 			, 0
@@ -2028,13 +2028,13 @@ namespace bgfx
 		if (0 < m_render->m_iboffset)
 		{
 			TransientIndexBuffer* ib = m_render->m_transientIb;
-			s_renderCtx.m_indexBuffers[ib->handle.idx].update(0, m_render->m_iboffset, ib->data);
+			s_renderCtx.m_indexBuffers[ib->handle.idx].update(0, m_render->m_iboffset, ib->data, true);
 		}
 
 		if (0 < m_render->m_vboffset)
 		{
 			TransientVertexBuffer* vb = m_render->m_transientVb;
-			s_renderCtx.m_vertexBuffers[vb->handle.idx].update(0, m_render->m_vboffset, vb->data);
+			s_renderCtx.m_vertexBuffers[vb->handle.idx].update(0, m_render->m_vboffset, vb->data, true);
 		}
 
 		m_render->sort();
diff --git a/src/renderer_d3d9.h b/src/renderer_d3d9.h
index 191a92f5..9b9e6bb4 100644
--- a/src/renderer_d3d9.h
+++ b/src/renderer_d3d9.h
@@ -148,13 +148,13 @@ namespace bgfx
 		}
 
 		void create(uint32_t _size, void* _data);
-		void update(uint32_t _offset, uint32_t _size, void* _data)
+		void update(uint32_t _offset, uint32_t _size, void* _data, bool _discard = false)
 		{
 			void* buffer;
 			DX_CHECK(m_ptr->Lock(_offset
 				, _size
 				, &buffer
-				, m_dynamic && 0 == _offset && m_size == _size ? D3DLOCK_DISCARD : 0
+				, _discard || (m_dynamic && 0 == _offset && m_size == _size) ? D3DLOCK_DISCARD : 0
 				) );
 
 			memcpy(buffer, _data, _size);
@@ -188,13 +188,13 @@ namespace bgfx
 		}
 
 		void create(uint32_t _size, void* _data, VertexDeclHandle _declHandle);
-		void update(uint32_t _offset, uint32_t _size, void* _data)
+		void update(uint32_t _offset, uint32_t _size, void* _data, bool _discard = false)
 		{
 			void* buffer;
 			DX_CHECK(m_ptr->Lock(_offset
 				, _size
 				, &buffer
-				, m_dynamic && 0 == _offset && m_size == _size ? D3DLOCK_DISCARD : 0
+				, _discard || (m_dynamic && 0 == _offset && m_size == _size) ? D3DLOCK_DISCARD : 0
 				) );
 
 			memcpy(buffer, _data, _size);