diff --git a/libraries/AP_InertialNav/examples/AP_InertialNav_test/AP_InertialNav_test.pde b/libraries/AP_InertialNav/examples/AP_InertialNav_test/AP_InertialNav_test.pde
index d195cfd491..430b40f397 100644
--- a/libraries/AP_InertialNav/examples/AP_InertialNav_test/AP_InertialNav_test.pde
+++ b/libraries/AP_InertialNav/examples/AP_InertialNav_test/AP_InertialNav_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 -*-
 
 #include <AP_Common.h>
 #include <AP_Progmem.h>