diff --git a/src/mingw-w64-1-math-h.patch b/src/mingw-w64-1-math-h.patch
new file mode 100644
index 00000000..7484f71e
--- /dev/null
+++ b/src/mingw-w64-1-math-h.patch
@@ -0,0 +1,18 @@
+This file is part of MXE.
+See index.html for further information.
+
+This patch was taken from:
+https://sourceforge.net/p/mingw-w64/code/6479/
+
+--- a/mingw-w64-headers/crt/math.h
++++ b/mingw-w64-headers/crt/math.h
+@@ -36,7 +36,7 @@
+ #endif
+ #endif
+ 
+-#ifndef __STRICT_ANSI__
++#if !defined(__STRICT_ANSI__) || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE) 
+ #define M_E		2.7182818284590452354
+ #define M_LOG2E		1.4426950408889634074
+ #define M_LOG10E	0.43429448190325182765
+