diff --git a/sys/lib/plumb/fileaddr b/sys/lib/plumb/fileaddr
index 0f08dc3ea..44a3a07f0 100644
--- a/sys/lib/plumb/fileaddr
+++ b/sys/lib/plumb/fileaddr
@@ -1,3 +1,2 @@
 addrelem='((#?[0-9]+)|(/[A-Za-z0-9_\^]+/?)|[.$])'
-addr=:($addrelem([,;+\-]$addrelem)*)
-
+addr=:($addrelem([,;+\-]$addrelem)*):?
diff --git a/sys/man/6/plumb b/sys/man/6/plumb
index bc58a5064..24201d4b8 100644
--- a/sys/man/6/plumb
+++ b/sys/man/6/plumb
@@ -344,7 +344,7 @@ The following is a modest, representative file of plumbing rules.
 # these are generally in order from most specific to least,
 # since first rule that fires wins.
 
-addr=':(#?[0-9]+)'
+addr=':(#?[0-9]+):?'
 protocol='(https?|ftp|file|gopher|mailto|news|nntp|telnet|wais)'
 domain='[a-zA-Z0-9_@]+([.:][a-zA-Z0-9_@]+)*/?[a-zA-Z0-9_?,%#~&/\e-]+'
 file='([:.][a-zA-Z0-9_?,%#~&/\e-]+)*'