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-rw-r--r--test/math/basic-test.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/test/math/basic-test.c b/test/math/basic-test.c
index e42c01457..04ec6ea31 100644
--- a/test/math/basic-test.c
+++ b/test/math/basic-test.c
@@ -17,6 +17,8 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
+#define _ISOC99_SOURCE
+
#include <math.h>
#include <float.h>
#include <stdio.h>