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-rw-r--r--src/math/_tgmath.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/math/_tgmath.h b/src/math/_tgmath.h
index 980d3c45..262a59a9 100644
--- a/src/math/_tgmath.h
+++ b/src/math/_tgmath.h
@@ -1,6 +1,7 @@
#ifndef __NONSTD_TGMATH_H__
#define __NONSTD_TGMATH_H__
#include <math.h>
+#include <fenv.h>
#include "_safety.h"
#ifndef FP_ZERO
@@ -41,7 +42,7 @@
#endif
#ifndef copysign
-#define copysign(_x, _y) (_x < 0 ? -_y : _y)
+#define copysign(_x, _y) ((_x) < 0 ? -(_y) : (_y))
#endif
#ifndef M_PI