diff --git a/misc/tools/xzipdiff b/misc/tools/xzipdiff
index 03824be..25c85f7 100755
--- a/misc/tools/xzipdiff
+++ b/misc/tools/xzipdiff
@@ -33,7 +33,7 @@ makepatchname()
 	echo "$prefix$fromversion"patch"$toversion$suffix"
 }
 
-zipdiff -z "zip -9r" -f "$from" -t "$to" -o "$output" -x "$excludes"
+zipdiff -f "$from" -t "$to" -o "$output" -x "$excludes"
 
 tempdir=`mktemp -d -t zipdiff.XXXXXX`
 cd "$tempdir"
@@ -47,7 +47,7 @@ for x in $excludes; do
 	patchname=`makepatchname "$x" "$fromname" "$toname"`
 	patchdir="c/$patchname"; patchdir=${patchdir%/*}
 	mkdir -p "$patchdir"
-	zipdiff -z "zip -9r" -f a/"$fromname" -t b/"$toname" -o c/"$patchname"
+	zipdiff -f a/"$fromname" -t b/"$toname" -o c/"$patchname"
 	if [ -f c/"$patchname" ]; then
 		(cd c && zip -0r "$output" "$patchname")
 	fi
diff --git a/misc/tools/zipdiff b/misc/tools/zipdiff
index 4b61c35..88ea560 100755
--- a/misc/tools/zipdiff
+++ b/misc/tools/zipdiff
@@ -14,7 +14,19 @@ output=
 from=
 to=
 excludes=
-ziptool="7za a -tzip -mx=9"
+ziptool="mkzip"
+
+mkzip()
+{
+	archive=$1; shift
+	sevenzipflags=-mx=9
+	zipflags=-9
+	ziplist=`mktemp`
+	find "$@" -xtype f \( -executable -or -type l \) -print > "$ziplist"
+	7za a -tzip $sevenzipflags -x@"$ziplist" "$archive" "$@" || true
+	zip         $zipflags -y   -@<"$ziplist" "$archive"      || true
+	rm -f "$ziplist"
+}
 
 while [ $# -gt 0 ]; do
 	o=$1