diff --git a/ChangeLog b/ChangeLog
index 8959260926..c624bac06c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Jan 20 23:58:02 2011  Tanaka Akira  <akr@fsij.org>
+
+	* node.h: parenthesize macro arguments.
+
 Thu Jan 20 23:25:28 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* configure.in: Add '#include <stdlib.h>' to
diff --git a/node.h b/node.h
index b9668beccc..9e922a4dbd 100644
--- a/node.h
+++ b/node.h
@@ -269,7 +269,7 @@ typedef struct RNode {
 
 #define nd_type(n) ((int) (((RNODE(n))->flags & NODE_TYPEMASK)>>NODE_TYPESHIFT))
 #define nd_set_type(n,t) \
-    RNODE(n)->flags=((RNODE(n)->flags&~NODE_TYPEMASK)|((((unsigned long)t)<<NODE_TYPESHIFT)&NODE_TYPEMASK))
+    RNODE(n)->flags=((RNODE(n)->flags&~NODE_TYPEMASK)|((((unsigned long)(t))<<NODE_TYPESHIFT)&NODE_TYPEMASK))
 
 #define NODE_LSHIFT (NODE_TYPESHIFT+7)
 #define NODE_LMASK  (((SIGNED_VALUE)1<<(sizeof(VALUE)*CHAR_BIT-NODE_LSHIFT))-1)