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-rw-r--r--mqtt_websockets/src/mqtt_wss_client.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mqtt_websockets/src/mqtt_wss_client.c b/mqtt_websockets/src/mqtt_wss_client.c
index 01e2ffce79..7d9d6a76cb 100644
--- a/mqtt_websockets/src/mqtt_wss_client.c
+++ b/mqtt_websockets/src/mqtt_wss_client.c
@@ -10,7 +10,9 @@
//
// You should have received a copy of the GNU General Public License along with this program.
// If not, see <https://www.gnu.org/licenses/>.
+#ifndef _GNU_SOURCE
#define _GNU_SOURCE
+#endif
#include "mqtt_wss_client.h"
#include "mqtt_ng.h"