diff --git a/libraries/AP_GPS/AP_GPS_SBF.cpp b/libraries/AP_GPS/AP_GPS_SBF.cpp
index 5a620c4917..5e52f8e49d 100644
--- a/libraries/AP_GPS/AP_GPS_SBF.cpp
+++ b/libraries/AP_GPS/AP_GPS_SBF.cpp
@@ -18,8 +18,6 @@
 //  Code by Michael Oborne
 //
 
-#define ALLOW_DOUBLE_MATH_FUNCTIONS
-
 #include "AP_GPS.h"
 #include "AP_GPS_SBF.h"
 #include <GCS_MAVLink/GCS.h>
diff --git a/libraries/AP_GPS/wscript b/libraries/AP_GPS/wscript
new file mode 100644
index 0000000000..942014b1c8
--- /dev/null
+++ b/libraries/AP_GPS/wscript
@@ -0,0 +1,4 @@
+
+# SBF driver needs double precision
+def configure(cfg):
+    cfg.env.DOUBLE_PRECISION_SOURCES['AP_GPS'] = ['AP_GPS_SBF.cpp']