diff --git a/ChangeLog b/ChangeLog
index b6b59f9b0..b670781d6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2009-07-31  suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
+
+	otvalid: Count the table size on memory by ptrdiff_t.
+
+	* src/otvalid/otvgpos.c (otv_ValueRecord_validate):
+	Change the type of table size from FT_UInt to
+	FT_PtrDist because it is calculated by the memory
+	addresses.
+
 2009-07-31  suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
 
 	otvalid: Prevent an overflow by GPOS/GSUB 32b-bit offset.
diff --git a/src/otvalid/otvgpos.c b/src/otvalid/otvgpos.c
index c8b42213c..49b46183a 100644
--- a/src/otvalid/otvgpos.c
+++ b/src/otvalid/otvgpos.c
@@ -209,7 +209,7 @@
     {
       if ( format & 1 )
       {
-        FT_UInt   table_size;
+        FT_PtrDist  table_size;
 
         OTV_OPTIONAL_TABLE( device );