diff --git a/test/system/250-systemd.bats b/test/system/250-systemd.bats
index 9521954f7d..677b07243a 100644
--- a/test/system/250-systemd.bats
+++ b/test/system/250-systemd.bats
@@ -319,7 +319,8 @@ LISTEN_FDNAMES=listen_fdnames" | sort)
     # stop systemd container
     service_cleanup
 
-    pasta_iface=$(default_ifname)
+    pasta_iface=$(default_ifname 4)
+    assert "$pasta_iface" != "" "pasta_iface is set"
 
     # now check that the rootless netns slirp4netns process is still alive and working
     run_podman unshare --rootless-netns ip addr
diff --git a/test/system/505-networking-pasta.bats b/test/system/505-networking-pasta.bats
index 9401563a1a..8aced2020d 100644
--- a/test/system/505-networking-pasta.bats
+++ b/test/system/505-networking-pasta.bats
@@ -784,7 +784,8 @@ EOF
 @test "Podman unshare --rootless-netns with Pasta" {
     skip_if_remote "unshare is local-only"
 
-    pasta_iface=$(default_ifname)
+    pasta_iface=$(default_ifname 4)
+    assert "$pasta_iface" != "" "pasta_iface is set"
 
     # First let's force a setup error by making pasta be "false".
     ln -s /usr/bin/false $PODMAN_TMPDIR/pasta