diff --git a/ChangeLog b/ChangeLog
index 06aa7e966..1ea174240 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2009-07-31  suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
+
+	smooth: Improve the format in debug message.
+
+	* src/smooth/ftgrays.c (gray_dump_cells): Improve the
+	format specifications to dump variables.
+
 2009-07-31  suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
 
 	sfnt: Fix a data type mismatching with its source.
diff --git a/src/smooth/ftgrays.c b/src/smooth/ftgrays.c
index ba5541d91..846e454e6 100644
--- a/src/smooth/ftgrays.c
+++ b/src/smooth/ftgrays.c
@@ -1349,7 +1349,7 @@
       printf( "%3d:", yindex );
 
       for ( cell = ras.ycells[yindex]; cell != NULL; cell = cell->next )
-        printf( " (%3d, c:%4d, a:%6d)", cell->x, cell->cover, cell->area );
+        printf( " (%3ld, c:%4ld, a:%6d)", cell->x, cell->cover, cell->area );
       printf( "\n" );
     }
   }