diff --git a/src/system-settings/nm-session-info.c b/src/system-settings/nm-session-info.c
index 28421ce144..07e4820566 100644
--- a/src/system-settings/nm-session-info.c
+++ b/src/system-settings/nm-session-info.c
@@ -1,3 +1,4 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
 /* NetworkManager user session tracker -- per-session data
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/system-settings/nm-session-info.h b/src/system-settings/nm-session-info.h
index 5dc1ab4840..f44aeaf244 100644
--- a/src/system-settings/nm-session-info.h
+++ b/src/system-settings/nm-session-info.h
@@ -1,3 +1,4 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
 /* NetworkManager user session tracker -- per-session data
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/system-settings/nm-session-manager.c b/src/system-settings/nm-session-manager.c
index d67f61902e..931610e81b 100644
--- a/src/system-settings/nm-session-manager.c
+++ b/src/system-settings/nm-session-manager.c
@@ -1,3 +1,4 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
 /* NetworkManager user session tracker
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/system-settings/nm-session-manager.h b/src/system-settings/nm-session-manager.h
index 1f1d9668a6..a7f8642ca9 100644
--- a/src/system-settings/nm-session-manager.h
+++ b/src/system-settings/nm-session-manager.h
@@ -1,3 +1,4 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
 /* NetworkManager user session tracker
  *
  * This program is free software; you can redistribute it and/or modify