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-rw-r--r--tests/tests2/24_math_library.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/tests/tests2/24_math_library.c b/tests/tests2/24_math_library.c
index 4cc3d9e..514a25f 100644
--- a/tests/tests2/24_math_library.c
+++ b/tests/tests2/24_math_library.c
@@ -1,3 +1,5 @@
+#define _ISOC99_SOURCE 1
+
#include <stdio.h>
#include <math.h>