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-rw-r--r--crypto/bio/b_addr.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/crypto/bio/b_addr.c b/crypto/bio/b_addr.c
index d11268b6dc..c3f669329b 100644
--- a/crypto/bio/b_addr.c
+++ b/crypto/bio/b_addr.c
@@ -7,6 +7,10 @@
* https://www.openssl.org/source/license.html
*/
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
+
#include <assert.h>
#include <string.h>