diff --git a/tools/testing/selftests/net/forwarding/custom_multipath_hash.sh b/tools/testing/selftests/net/forwarding/custom_multipath_hash.sh
index 1783c10215e5..7d531f7091e6 100755
--- a/tools/testing/selftests/net/forwarding/custom_multipath_hash.sh
+++ b/tools/testing/selftests/net/forwarding/custom_multipath_hash.sh
@@ -224,10 +224,10 @@ send_dst_ipv6()
 send_flowlabel()
 {
 	# Generate 16384 echo requests, each with a random flow label.
-	for _ in $(seq 1 16384); do
-		ip vrf exec v$h1 \
-			$PING6 2001:db8:4::2 -F 0 -c 1 -q >/dev/null 2>&1
-	done
+	ip vrf exec v$h1 sh -c \
+		"for _ in {1..16384}; do \
+			$PING6 2001:db8:4::2 -F 0 -c 1 -q >/dev/null 2>&1; \
+		done"
 }
 
 send_src_udp6()
diff --git a/tools/testing/selftests/net/forwarding/gre_custom_multipath_hash.sh b/tools/testing/selftests/net/forwarding/gre_custom_multipath_hash.sh
index 9788bd0f6e8b..dda11a4a9450 100755
--- a/tools/testing/selftests/net/forwarding/gre_custom_multipath_hash.sh
+++ b/tools/testing/selftests/net/forwarding/gre_custom_multipath_hash.sh
@@ -319,10 +319,10 @@ send_dst_ipv6()
 send_flowlabel()
 {
 	# Generate 16384 echo requests, each with a random flow label.
-	for _ in $(seq 1 16384); do
-		ip vrf exec v$h1 \
-			$PING6 2001:db8:2::2 -F 0 -c 1 -q >/dev/null 2>&1
-	done
+	ip vrf exec v$h1 sh -c \
+		"for _ in {1..16384}; do \
+			$PING6 2001:db8:2::2 -F 0 -c 1 -q >/dev/null 2>&1; \
+		done"
 }
 
 send_src_udp6()
diff --git a/tools/testing/selftests/net/forwarding/ip6gre_custom_multipath_hash.sh b/tools/testing/selftests/net/forwarding/ip6gre_custom_multipath_hash.sh
index 2ab9eaaa5532..e28b4a079e52 100755
--- a/tools/testing/selftests/net/forwarding/ip6gre_custom_multipath_hash.sh
+++ b/tools/testing/selftests/net/forwarding/ip6gre_custom_multipath_hash.sh
@@ -321,10 +321,10 @@ send_dst_ipv6()
 send_flowlabel()
 {
 	# Generate 16384 echo requests, each with a random flow label.
-	for _ in $(seq 1 16384); do
-		ip vrf exec v$h1 \
-			$PING6 2001:db8:2::2 -F 0 -c 1 -q >/dev/null 2>&1
-	done
+	ip vrf exec v$h1 sh -c \
+		"for _ in {1..16384}; do \
+			$PING6 2001:db8:2::2 -F 0 -c 1 -q >/dev/null 2>&1; \
+		done"
 }
 
 send_src_udp6()