diff --git a/tests/zfs-tests/tests/functional/block_cloning/block_cloning.kshlib b/tests/zfs-tests/tests/functional/block_cloning/block_cloning.kshlib
index 526bd54a2bf3..50f3a3d262c0 100644
--- a/tests/zfs-tests/tests/functional/block_cloning/block_cloning.kshlib
+++ b/tests/zfs-tests/tests/functional/block_cloning/block_cloning.kshlib
@@ -1,58 +1,58 @@
 #!/bin/ksh -p
 #
 # CDDL HEADER START
 #
 # The contents of this file are subject to the terms of the
 # Common Development and Distribution License (the "License").
 # You may not use this file except in compliance with the License.
 #
 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 # or https://opensource.org/licenses/CDDL-1.0.
 # See the License for the specific language governing permissions
 # and limitations under the License.
 #
 # When distributing Covered Code, include this CDDL HEADER in each
 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 # If applicable, add the following below this CDDL HEADER, with the
 # fields enclosed by brackets "[]" replaced with your own identifying
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
 
 #
 # Copyright (c) 2023, Klara Inc.
 #
 
 . $STF_SUITE/include/libtest.shlib
 
 function have_same_content
 {
 	typeset hash1=$(md5digest $1)
 	typeset hash2=$(md5digest $2)
 
 	log_must [ "$hash1" = "$hash2" ]
 }
 
 #
 # get_same_blocks dataset1 path/to/file1 dataset2 path/to/file2
 #
 # Returns a space-separated list of the indexes (starting at 0) of the L0
 # blocks that are shared between both files (by first DVA and checksum).
 # Assumes that the two files have the same content, use have_same_content to
 # confirm that.
 #
 function get_same_blocks
 {
     KEY=$5
     if [ ${#KEY} -gt 0 ]; then
         KEY="--key=$KEY"
     fi
 	typeset zdbout=${TMPDIR:-$TEST_BASE_DIR}/zdbout.$$
 	zdb $KEY -vvvvv $1 -O $2 | \
 	    awk '/ L0 / { print l++ " " $3 " " $7 }' > $zdbout.a
 	zdb $KEY -vvvvv $3 -O $4 | \
 	    awk '/ L0 / { print l++ " " $3 " " $7 }' > $zdbout.b
-	echo $(sort $zdbout.a $zdbout.b | uniq -d | cut -f1 -d' ')
+	echo $(sort -n $zdbout.a $zdbout.b | uniq -d | cut -f1 -d' ')
 }