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-rw-r--r--test/edge_cases.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/edge_cases.c b/test/edge_cases.c
index ce47f72..46c19d4 100644
--- a/test/edge_cases.c
+++ b/test/edge_cases.c
@@ -1,3 +1,4 @@
+#define _POSIX_C_SOURCE 200809L
#include <math.h>
#include <stdbool.h>
#include <stddef.h>