diff --git a/ChangeLog b/ChangeLog
index cbd399ccb6..14c8279c9e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Nov 19 00:47:09 2009  Tanaka Akira  <akr@fsij.org>
+
+	* io.c (MORE_CHAR_SUSPENDED): renamed from MORE_CHAR_CBUF_FULL.
+
 Wed Nov 18 22:00:13 2009  Tanaka Akira  <akr@fsij.org>
 
 	* io.c (fill_cbuf): extracted from more_char.
diff --git a/io.c b/io.c
index 5c10c69930..7b0afa44cd 100644
--- a/io.c
+++ b/io.c
@@ -1582,7 +1582,7 @@ make_readconv(rb_io_t *fptr, int size)
     }
 }
 
-#define MORE_CHAR_CBUF_FULL Qtrue
+#define MORE_CHAR_SUSPENDED Qtrue
 #define MORE_CHAR_FINISHED Qnil
 static VALUE
 fill_cbuf(rb_io_t *fptr, int ec_flags)
@@ -1597,7 +1597,7 @@ fill_cbuf(rb_io_t *fptr, int ec_flags)
     ec_flags |= ECONV_PARTIAL_INPUT;
 
     if (fptr->cbuf_len == fptr->cbuf_capa)
-        return MORE_CHAR_CBUF_FULL; /* cbuf full */
+        return MORE_CHAR_SUSPENDED; /* cbuf full */
     if (fptr->cbuf_len == 0)
         fptr->cbuf_off = 0;
     else if (fptr->cbuf_off + fptr->cbuf_len == fptr->cbuf_capa) {
@@ -1629,7 +1629,7 @@ fill_cbuf(rb_io_t *fptr, int ec_flags)
             return exc;
 
         if (cbuf_len0 != fptr->cbuf_len)
-            return MORE_CHAR_CBUF_FULL;
+            return MORE_CHAR_SUSPENDED;
 
         if (res == econv_finished) {
             return MORE_CHAR_FINISHED;
@@ -1656,7 +1656,7 @@ more_char(rb_io_t *fptr)
 {
     VALUE v;
     v = fill_cbuf(fptr, ECONV_AFTER_OUTPUT);
-    if (v != MORE_CHAR_CBUF_FULL && v != MORE_CHAR_FINISHED)
+    if (v != MORE_CHAR_SUSPENDED && v != MORE_CHAR_FINISHED)
         rb_exc_raise(v);
     return v;
 }
@@ -1708,7 +1708,7 @@ read_all(rb_io_t *fptr, long siz, VALUE str)
                 io_shift_cbuf(fptr, fptr->cbuf_len, &str);
             }
             v = fill_cbuf(fptr, 0);
-            if (v != MORE_CHAR_CBUF_FULL && v != MORE_CHAR_FINISHED) {
+            if (v != MORE_CHAR_SUSPENDED && v != MORE_CHAR_FINISHED) {
                 if (fptr->cbuf_len) {
                     io_shift_cbuf(fptr, fptr->cbuf_len, &str);
                 }