diff --git a/src/mobility/position.h b/src/mobility/position.h
index 884ba50b0..d34fadfb2 100644
--- a/src/mobility/position.h
+++ b/src/mobility/position.h
@@ -1,3 +1,4 @@
+/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
 #ifndef POSITION_H
 #define POSITION_H
 
diff --git a/src/mobility/random-position.h b/src/mobility/random-position.h
index ee97a2286..8fcc54a6d 100644
--- a/src/mobility/random-position.h
+++ b/src/mobility/random-position.h
@@ -1,3 +1,4 @@
+/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
 #ifndef RANDOM_POSITION_H
 #define RANDOM_POSITION_H
 
diff --git a/src/mobility/speed.h b/src/mobility/speed.h
index 5e2ad3c45..317fc4333 100644
--- a/src/mobility/speed.h
+++ b/src/mobility/speed.h
@@ -1,3 +1,4 @@
+/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
 #ifndef SPEED_H
 #define SPEED_H
 
diff --git a/src/mobility/static-speed-helper.h b/src/mobility/static-speed-helper.h
index 0ba541b75..8737f2edd 100644
--- a/src/mobility/static-speed-helper.h
+++ b/src/mobility/static-speed-helper.h
@@ -1,3 +1,4 @@
+/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
 #ifndef STATIC_SPEED_HELPER_H
 #define STATIC_SPEED_HELPER_H