diff --git a/include/ucore/ucore_utils.h b/include/ucore/ucore_utils.h
index 0c72564..fc389cc 100644
--- a/include/ucore/ucore_utils.h
+++ b/include/ucore/ucore_utils.h
@@ -46,7 +46,7 @@
 //give us the struct foo*:
 //struct foo *f = CONTAINER_OF(p, struct foo, zap);
 #define CONTAINER_OF(ptr, type, member) ({                  \
-const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
+typeof( ((type *)0)->member ) *__mptr = (ptr);    \
     (type *)( (char *)__mptr - offsetof(type, member) ); })
 
 #define UC_ALIGN(val,align) (((val)+(align)-1UL)&~((align)-1UL))