--- a/ipkg-build
+++ b/ipkg-build
@@ -250,6 +250,11 @@ mkdir $tmp_dir
 
 echo $CONTROL > $tmp_dir/tarX
 ( cd $pkg_dir && $TAR $ogargs -X $tmp_dir/tarX -czf $tmp_dir/data.tar.gz . )
+
+installed_size=`du -b $tmp_dir/data.tar.gz | cut -f1`
+sed -i -e "s/^Installed-Size: .*/Installed-Size: $installed_size/" \
+	$pkg_dir/$CONTROL/control
+
 ( cd $pkg_dir/$CONTROL && $TAR $ogargs -czf $tmp_dir/control.tar.gz . )
 rm $tmp_dir/tarX