diff --git a/conf/boards/hb_1.1.makefile b/conf/boards/hb_1.1.makefile
index 382653cdda..8cb1393b3a 100644
--- a/conf/boards/hb_1.1.makefile
+++ b/conf/boards/hb_1.1.makefile
@@ -29,5 +29,9 @@ ifndef MODEM_BAUD
 MODEM_BAUD = B57600
 endif
 
+ifndef GPS_PORT
 GPS_PORT=UART1
+endif
+ifndef GPS_BAUD
 GPS_BAUD=B38400
+endif