diff --git a/i3-config-wizard/xcb.h b/i3-config-wizard/xcb.h
index 4ed182c4..372ed161 100644
--- a/i3-config-wizard/xcb.h
+++ b/i3-config-wizard/xcb.h
@@ -1,5 +1,5 @@
-#ifndef _XCB_H
-#define _XCB_H
+#ifndef I3_XCB_H
+#define I3_XCB_H
 
 /* from X11/keysymdef.h */
 #define XCB_NUM_LOCK                    0xff7f
diff --git a/i3-input/i3-input.h b/i3-input/i3-input.h
index f494cbd5..f1d5f077 100644
--- a/i3-input/i3-input.h
+++ b/i3-input/i3-input.h
@@ -1,5 +1,5 @@
-#ifndef _I3_INPUT
-#define _I3_INPUT
+#ifndef I3_INPUT
+#define I3_INPUT
 
 #include <err.h>
 
diff --git a/i3-nagbar/i3-nagbar.h b/i3-nagbar/i3-nagbar.h
index 5a21226b..379a7f6f 100644
--- a/i3-nagbar/i3-nagbar.h
+++ b/i3-nagbar/i3-nagbar.h
@@ -1,5 +1,5 @@
-#ifndef _I3_NAGBAR
-#define _I3_NAGBAR
+#ifndef I3_NAGBAR
+#define I3_NAGBAR
 
 #include <err.h>