src/nnn.c | 3 +++

diff --git a/src/nnn.c b/src/nnn.c
index 67eb9bcfbf6a63fefa4733fd5df85f3b3497cf62..d3d09478aa1cfcbe99de638faed919e497dd09df 100644
--- a/src/nnn.c
+++ b/src/nnn.c
@@ -29,6 +29,9 @@  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifdef __linux__
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
 #if defined(__arm__) || defined(__i386__)
 #define _FILE_OFFSET_BITS 64 /* Support large files on 32-bit */
 #endif