diff --git a/src/nnn.c b/src/nnn.c
index af494b99..7b108b65 100644
--- a/src/nnn.c
+++ b/src/nnn.c
@@ -28,7 +28,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifdef __linux__
+#if defined(__linux__) || defined(MINGW) || defined(__MINGW32__) || defined(__MINGW64__) || defined(__CYGWIN__)
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif