diff --git a/opensubdiv/osd/d3d11ComputeEvaluator.cpp b/opensubdiv/osd/d3d11ComputeEvaluator.cpp
index 804717ec..eb1a09d1 100644
--- a/opensubdiv/osd/d3d11ComputeEvaluator.cpp
+++ b/opensubdiv/osd/d3d11ComputeEvaluator.cpp
@@ -204,8 +204,11 @@ D3D11ComputeEvaluator::Compile(BufferDescriptor const &srcDesc,
         return false;
     }
 
-    DWORD dwShaderFlags = D3DCOMPILE_ENABLE_STRICTNESS
-        | D3D10_SHADER_RESOURCES_MAY_ALIAS;
+    DWORD dwShaderFlags = D3DCOMPILE_ENABLE_STRICTNESS;
+#if defined(D3D10_SHADER_RESOURCES_MAY_ALIAS)
+     dwShaderFlags |= D3D10_SHADER_RESOURCES_MAY_ALIAS;
+#endif
+
 #ifdef _DEBUG
     dwShaderFlags |= D3DCOMPILE_DEBUG;
 #endif