diff --git a/src/osd/windows/winprefix.h b/src/osd/windows/winprefix.h
index 72f6baf69b1..07f8800b787 100644
--- a/src/osd/windows/winprefix.h
+++ b/src/osd/windows/winprefix.h
@@ -38,5 +38,14 @@
 #define min(x,y) fmin(x,y)
 #define max(x,y) fmax(x,y)
 #endif
+#ifdef _MSC_VER
+#if _MSC_VER < 1800
+#define _USE_MATH_DEFINES
+#include <math.h>
+static __inline double fmin(double x, double y){ return (x < y) ? x : y; }
+static __inline double fmax(double x, double y){ return (x > y) ? x : y; }
+static __inline double log2(double x) { return log(x) * M_LOG2E; }
+#endif
+#endif
 
 #define PATH_SEPARATOR      "\\"