diff --git a/PC/pyconfig.h b/PC/pyconfig.h
index a45d5eb..a49ce69 100644
--- a/PC/pyconfig.h
+++ b/PC/pyconfig.h
@@ -217,7 +217,11 @@
 #define Py_IS_INFINITY(X) (!_finite(X) && !_isnan(X))
 #define Py_IS_FINITE(X) _finite(X)
 #define copysign _copysign
+
+/* VS 2010 and above already defines hypot as _hypot */
+#if _MSC_VER < 1600
 #define hypot _hypot
+#endif
 
 #endif /* _MSC_VER */