diff --git a/config.gen3.h b/config.gen3.h
index 18530d8..6e42790 100644
--- a/config.gen3.h
+++ b/config.gen3.h
@@ -1,5 +1,4 @@
-#ifndef	_CONFIG_H
-#define	_CONFIG_H
+/* Notice to developers: this file is intentionally included twice. */
 
 /*
 	CONTENTS
@@ -422,5 +421,3 @@ DEFINE_TEMP_SENSOR(noheater,	TT_INTERCOM,		0)
 * OCR5CL - PL5 - DIO44                                                      *
 *                                                                           *
 \***************************************************************************/
-
-#endif /* _CONFIG_H */
diff --git a/config.gen6.h b/config.gen6.h
index 415a839..2301728 100644
--- a/config.gen6.h
+++ b/config.gen6.h
@@ -1,5 +1,4 @@
-#ifndef	_CONFIG_H
-#define	_CONFIG_H
+/* Notice to developers: this file is intentionally included twice. */
 
 /*
   Sample configuration file for the GEN6-Board sold by Camiel Gubbels.
@@ -411,5 +410,3 @@ DEFINE_HEATER(extruder,   PORTD, PIND6, OCR2B)
 * OCR5CL - PL5 - DIO44                                                      *
 *                                                                           *
 \***************************************************************************/
-
-#endif /* _CONFIG_H */
diff --git a/config.h.dist b/config.h.dist
index 7c0ea11..de64e2f 100644
--- a/config.h.dist
+++ b/config.h.dist
@@ -1,5 +1,4 @@
-#ifndef	_CONFIG_H
-#define	_CONFIG_H
+/* Notice to developers: this file is intentionally included twice. */
 
 /*
 	CONTENTS
@@ -439,5 +438,3 @@ DEFINE_HEATER(bed,			PORTB, PINB4, OCR0B)
 * OCR5CL - PL5 - DIO44                                                      *
 *                                                                           *
 \***************************************************************************/
-
-#endif /* _CONFIG_H */
diff --git a/config.ramps.h b/config.ramps.h
index 70107be..f5d81a9 100644
--- a/config.ramps.h
+++ b/config.ramps.h
@@ -1,5 +1,4 @@
-#ifndef	_CONFIG_H
-#define	_CONFIG_H
+/* Notice to developers: this file is intentionally included twice. */
 
 /*
 	CONTENTS
@@ -425,5 +424,3 @@ DEFINE_HEATER(fan,			PORTH, PINH6, OCR2B)
 * OCR5CL - PL5 - DIO44                                                      *
 *                                                                           *
 \***************************************************************************/
-
-#endif /* _CONFIG_H */