diff --git a/packages/antlion/utils.py b/packages/antlion/utils.py
index b4e8aa0..050190e 100755
--- a/packages/antlion/utils.py
+++ b/packages/antlion/utils.py
@@ -1901,15 +1901,8 @@
         string, mac address
             e.g. '12:34:56:78:9a:bc'
     """
-    hex_list = []
-    for octet in mac_addr_list:
-        hex_octet = hex(octet)[2:]
-        if octet < 16:
-            hex_list.append(f"0{hex_octet}")
-        else:
-            hex_list.append(hex_octet)
-
-    return ":".join(hex_list)
+    # Print each octet as hex, right justified, width of 2, and fill with "0".
+    return ":".join([f"{octet:0>2x}" for octet in mac_addr_list])
 
 
 def get_fuchsia_mdns_ipv6_address(device_mdns_name):