diff --git a/src/d3d11/d3d11_context_imm.cpp b/src/d3d11/d3d11_context_imm.cpp
index d164f4c03..461dad65b 100644
--- a/src/d3d11/d3d11_context_imm.cpp
+++ b/src/d3d11/d3d11_context_imm.cpp
@@ -334,6 +334,9 @@ namespace dxvk {
     if (unlikely(Subresource >= pResource->CountSubresources()))
       return E_INVALIDARG;
 
+    if (unlikely(pResource->GetMapType(Subresource) != D3D11_MAP(~0u)))
+      return E_OUTOFMEMORY;
+
     pResource->SetMapType(Subresource, MapType);
 
     VkFormat packedFormat = m_parent->LookupPackedFormat(