diff --git a/ieee/MA/ma-to-manufacturer-table.pl b/ieee/MA/ma-to-manufacturer-table.pl
index 27ae3d2..88295a3 100755
--- a/ieee/MA/ma-to-manufacturer-table.pl
+++ b/ieee/MA/ma-to-manufacturer-table.pl
@@ -96,8 +96,8 @@
       $row->{abbrev},
       $row->{base},
       $row->{bits},
-      $row->{first},
-      $row->{last},
+      (join ':', unpack("(a2)*", $row->{first})),
+      (join ':', unpack("(a2)*", $row->{last})),
       $row->{range};
 }