diff --git a/include/rtthread.h b/include/rtthread.h
index e43c3af1ea..0e98753c6f 100644
--- a/include/rtthread.h
+++ b/include/rtthread.h
@@ -14,8 +14,7 @@
  * 2006-08-10     Bernard      add version information
  * 2007-01-28     Bernard      rename RT_OBJECT_Class_Static to RT_Object_Class_Static
  * 2007-03-03     Bernard      clean up the definitions to rtdef.h
- * 2010-04-11     yi.qiu          add module feature
-
+ * 2010-04-11     yi.qiu       add module feature
  */
 
 #ifndef __RT_THREAD_H__
diff --git a/src/rtm.c b/src/rtm.c
index f6e459ec0d..9a5986d19c 100644
--- a/src/rtm.c
+++ b/src/rtm.c
@@ -16,7 +16,7 @@
 #include <rtm.h>
 
 /* some buildin kernel symbol */
-
+#ifdef RT_USING_MODULE
 /*
  * thread  interface symbol 
  */
@@ -142,3 +142,4 @@ RTM_EXPORT(rt_timer_control)
  */
 RTM_EXPORT(rt_kprintf)
 
+#endif