diff --git a/Headers/gnustep/base/Notification.h b/Headers/gnustep/base/Notification.h
index 6b1cf1780..1c8485dfe 100644
--- a/Headers/gnustep/base/Notification.h
+++ b/Headers/gnustep/base/Notification.h
@@ -21,6 +21,9 @@
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#ifndef __Notification_h_OBJECTS_INCLUDE
+#define __Notification_h_OBJECTS_INCLUDE
+
 #include <objects/stdobjects.h>
 #include <objects/NSString.h>
 #include <objects/KeyedCollecting.h>
@@ -51,3 +54,5 @@
 	      userInfo: info;
 
 @end
+
+#endif /* __Notification_h_OBJECTS_INCLUDE */
diff --git a/Source/objects/Notification.h b/Source/objects/Notification.h
index 6b1cf1780..1c8485dfe 100644
--- a/Source/objects/Notification.h
+++ b/Source/objects/Notification.h
@@ -21,6 +21,9 @@
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#ifndef __Notification_h_OBJECTS_INCLUDE
+#define __Notification_h_OBJECTS_INCLUDE
+
 #include <objects/stdobjects.h>
 #include <objects/NSString.h>
 #include <objects/KeyedCollecting.h>
@@ -51,3 +54,5 @@
 	      userInfo: info;
 
 @end
+
+#endif /* __Notification_h_OBJECTS_INCLUDE */