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-rw-r--r--src/math/copysign.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/math/copysign.c b/src/math/copysign.c
index 2ace3c1d..c807cfc3 100644
--- a/src/math/copysign.c
+++ b/src/math/copysign.c
@@ -2,6 +2,8 @@
#include "_tgmath.h"
#include <math.h>
+#undef copysign
+
TYPE TGFN(copysign)(TYPE x, TYPE y)
{
if (isnan(x)) {