diff --git a/APMrover2/setup.pde b/APMrover2/setup.pde
index 1e98ae2e34..58e7aa54ef 100644
--- a/APMrover2/setup.pde
+++ b/APMrover2/setup.pde
@@ -510,7 +510,7 @@ static void report_compass()
 
 	// mag declination
 	cliSerial->printf_P(PSTR("Mag Declination: %4.4f\n"),
-							degrees(compass.get_declination()));
+							(double)degrees(compass.get_declination()));
 
 	Vector3f offsets = compass.get_offsets();