diff --git a/Makefile.include b/Makefile.include
index 149086d7c..d4478c748 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -191,6 +191,8 @@ endif
 
 ifneq ($(RELSTR),)
 CFLAGS += -DCONTIKI_VERSION_STRING=\"Contiki-$(RELSTR)\"
+else
+CFLAGS += -DCONTIKI_VERSION_STRING=\"Contiki-3.x\"
 endif
 
 ### Automatic dependency generation
diff --git a/core/contiki-version.h b/core/contiki-version.h
deleted file mode 100644
index 35b61a9ea..000000000
--- a/core/contiki-version.h
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * Copyright (c) 2004, Swedish Institute of Computer Science.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the Institute nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * This file is part of the Contiki operating system.
- *
- * Author: Adam Dunkels <adam@sics.se>
- *
- */
-#ifndef __CONTIKI_VERSION__
-#define __CONTIKI_VERSION__
-
-#ifndef CONTIKI_VERSION_STRING
-#define CONTIKI_VERSION_STRING "Contiki 3.x"
-#endif /* CONTIKI_VERSION_STRING */
-
-#endif /* __CONTIKI_VERSION__ */
diff --git a/core/contiki.h b/core/contiki.h
index f3eb1de4d..816b21dd6 100644
--- a/core/contiki.h
+++ b/core/contiki.h
@@ -34,7 +34,6 @@
 #ifndef CONTIKI_H_
 #define CONTIKI_H_
 
-#include "contiki-version.h"
 #include "contiki-conf.h"
 #include "contiki-default-conf.h"