diff --git a/ChangeLog b/ChangeLog
index 8e13775..be2eca0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 2009-08-13  Vladimir Serbinenko  <phcoder@gmail.com>
 
+	Handle group offset on UFS1.
+
+	* fs/ufs.c (grub_ufs_sblock): New field 'cylg_mask'.
+	(grub_ufs_read_inode) [!MODE_UFS2]: handle cylg_offset and cylg_mask.
+	
+2009-08-13  Vladimir Serbinenko  <phcoder@gmail.com>
+
 	Split ufs.mod into ufs1.mod and ufs2.mod.
 
 	* conf/common.rmk (grub_probe_SOURCES): Add fs/ufs2.c.
diff --git a/fs/ufs.c b/fs/ufs.c
index 7f254af..13727f8 100644
--- a/fs/ufs.c
+++ b/fs/ufs.c
@@ -88,7 +88,7 @@ struct grub_ufs_sblock
 
   /* The start of the cylinder group.  */
   grub_uint32_t cylg_offset;
-  grub_uint8_t unused3[4];
+  grub_uint32_t cylg_mask;
 
   grub_uint32_t mtime;
   grub_uint8_t unused4[12];
@@ -360,6 +360,11 @@ grub_ufs_read_inode (struct grub_ufs_data *data, int ino, char *inode)
   /* The first block of the group.  */
   int grpblk = group * (grub_le_to_cpu32 (sblock->frags_per_group));
 
+#ifndef MODE_UFS2
+  grpblk += grub_le_to_cpu32 (sblock->cylg_offset)
+    * (group & (~grub_le_to_cpu32 (sblock->cylg_mask)));
+#endif
+
   if (!inode)
     {
       inode = (char *) &data->inode;