diff --git a/libraries/AP_AHRS/examples/AHRS_Test/AHRS_Test.pde b/libraries/AP_AHRS/examples/AHRS_Test/AHRS_Test.pde
index 1b8d3802600..c4bf1342711 100644
--- a/libraries/AP_AHRS/examples/AHRS_Test/AHRS_Test.pde
+++ b/libraries/AP_AHRS/examples/AHRS_Test/AHRS_Test.pde
@@ -1,4 +1,4 @@
-// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: t -*-
+// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
 
 //
 // Simple test for the AP_AHRS interface