diff --git a/libraries/AP_Buffer/AP_Buffer.cpp b/libraries/AP_Buffer/AP_Buffer.cpp
index 9dc5450b57..f8ed0830ce 100644
--- a/libraries/AP_Buffer/AP_Buffer.cpp
+++ b/libraries/AP_Buffer/AP_Buffer.cpp
@@ -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 -*-
 
 /// @file	AP_Buffer.h
 /// @brief	fifo buffer template class
diff --git a/libraries/AP_Buffer/AP_Buffer.h b/libraries/AP_Buffer/AP_Buffer.h
index 37fbd49a2e..e55c293b9f 100644
--- a/libraries/AP_Buffer/AP_Buffer.h
+++ b/libraries/AP_Buffer/AP_Buffer.h
@@ -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 -*-
 
 /// @file	AP_Buffer.h
 /// @brief	fifo buffer template class