diff --git a/SPIRV/hex_float.h b/SPIRV/hex_float.h
index ea403a77..24a26079 100644
--- a/SPIRV/hex_float.h
+++ b/SPIRV/hex_float.h
@@ -23,6 +23,19 @@
 #include <limits>
 #include <sstream>
 
+#if defined(_MSC_VER) && _MSC_VER < 1700
+namespace std {
+bool isnan(double f)
+{
+  return ::_isnan(f) != 0;
+}
+bool isinf(double f)
+{
+  return ::_finite(f) == 0;
+}
+}
+#endif
+
 #include "bitutils.h"
 
 namespace spvutils {