--- ray/src/common/rtmath.h	2016/03/10 18:09:43	3.10
+++ ray/src/common/rtmath.h	2016/03/10 18:24:49	3.11
@@ -1,4 +1,4 @@
-/* RCSid $Id: rtmath.h,v 3.10 2016/03/10 18:09:43 schorsch Exp $ */
+/* RCSid $Id: rtmath.h,v 3.11 2016/03/10 18:24:49 schorsch Exp $ */
 /*
  * Header for Radiance vector and math routines
  */
@@ -47,7 +47,7 @@ extern double	atan2a(double y, double x);
 #endif
 
 /* VC 2015 has those defined (XXX possibly earlier?) */
-#if ((defined(_WIN32) || defined(_WIN64))
+#if ((defined(_WIN32) || defined(_WIN64)) \
 		&& (!defined(_MS_VER) || _MS_VER < 1900))
 extern double	erf(double x);
 extern double	erfc(double x);