diff --git a/plugins/GSdx/Renderers/DX11/GSDevice11.cpp b/plugins/GSdx/Renderers/DX11/GSDevice11.cpp
index e9849ecb65..1caf0fa8ee 100644
--- a/plugins/GSdx/Renderers/DX11/GSDevice11.cpp
+++ b/plugins/GSdx/Renderers/DX11/GSDevice11.cpp
@@ -497,8 +497,7 @@ void GSDevice11::BeforeDraw()
 		if (tex->Equal(m_state.rt_texture) || tex->Equal(m_state.rt_ds))
 		{
 #ifdef _DEBUG
-			std::wstring tmp(L"WARNING: FB read detected on slot " + std::to_wstring(i) + L", copying...");
-			OutputDebugString(tmp.c_str());
+			OutputDebugStringA(format("WARNING: Cleaning up copied texture on slot %i", i).c_str());
 #endif
 			GSTexture* cp = nullptr;
 
@@ -519,8 +518,7 @@ void GSDevice11::AfterDraw()
 	while (_BitScanForward(&i, m_state.ps_sr_bitfield))
 	{
 #ifdef _DEBUG
-		std::wstring tmp(L"WARNING: Cleaning up copied texture on slot " + std::to_wstring(i));
-		OutputDebugString(tmp.c_str());
+		OutputDebugStringA(format("WARNING: FB read detected on slot %i, copying...", i).c_str());
 #endif
 		Recycle(m_state.ps_sr_texture[i]);
 		PSSetShaderResource(i, NULL);