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-rw-r--r--unit/test-ringbuf.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/unit/test-ringbuf.c b/unit/test-ringbuf.c
index a97524e44..ef3bf0a50 100644
--- a/unit/test-ringbuf.c
+++ b/unit/test-ringbuf.c
@@ -25,6 +25,7 @@
#include <config.h>
#endif
+#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdint.h>