diff --git a/src/lib/OpenEXR/ImfSimd.h b/src/lib/OpenEXR/ImfSimd.h
index 810e7ccc3..9bb4e11ae 100644
--- a/OpenEXR/IlmImf/ImfSimd.h
+++ b/OpenEXR/IlmImf/ImfSimd.h
@@ -14,7 +14,7 @@
 
 
 // GCC and Visual Studio SSE2 compiler flags
-#if defined __SSE2__ || (_MSC_VER >= 1300 && !_M_CEE_PURE)
+#if defined __SSE2__ || (_MSC_VER >= 1300 && (_M_IX86 || _M_X64))
     #define IMF_HAVE_SSE2 1
 #endif