diff --git a/ChangeLog b/ChangeLog
index 9daa4a4c3..d67663d50 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2009-07-31  suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
+
+	smooth: Fix a data type mismatching with its source.
+
+	* src/smooth/ftgrays.c (gray_sweep): The type of
+	`area' is matched with the 3rd argument `area'
+	of gray_hline().
+
 2009-07-31  suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
 
 	smooth: Fix a data type mismatching with its source.
diff --git a/src/smooth/ftgrays.c b/src/smooth/ftgrays.c
index ffe3592b6..b5530f7f9 100644
--- a/src/smooth/ftgrays.c
+++ b/src/smooth/ftgrays.c
@@ -1377,7 +1377,7 @@
 
       for ( ; cell != NULL; cell = cell->next )
       {
-        TArea  area;
+        TPos  area;
 
 
         if ( cell->x > x && cover != 0 )