diff --git a/conf/boards/booz_1.0.makefile b/conf/boards/booz_1.0.makefile
index 7df1cf8039c..1f56efef5b6 100644
--- a/conf/boards/booz_1.0.makefile
+++ b/conf/boards/booz_1.0.makefile
@@ -34,6 +34,10 @@ endif
 
 AHRS_ALIGNER_LED = 3
 
+ifndef GPS_PORT
 GPS_PORT=UART0
+endif
+ifndef GPS_BAUD
 GPS_BAUD=B38400
+endif
 GPS_LED=4