diff --git a/src/dev_arygon.c b/src/dev_arygon.c
index 63da211..0663766 100644
--- a/src/dev_arygon.c
+++ b/src/dev_arygon.c
@@ -25,7 +25,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifdef _WIN32
   #define SERIAL_STRING "COM"
 #endif
-#ifdef _LINUX
+#ifdef linux
   #define SERIAL_STRING "/dev/ttyusb"
 #endif
 #ifdef __APPLE__