diff --git a/.hgignore b/.hgignore
index 826e06293..641e347d6 100644
--- a/.hgignore
+++ b/.hgignore
@@ -2,7 +2,7 @@ syntax: regexp
 ^(386|68000|68020|alpha|amd64|arm|power|power64|sparc|sparc64)/(bin|lib)(/|$)
 ^(acme|sys/src)/(.*/)?[12578vqki]\..*$
 ^(acme|sys/src)/.*\.[ao]?[12578vqki]?$
-^(dev|fd|net.*|srv|shr|env|root|boot|mnt|n|bin|usr|cfg|cron|mail|tmp)(/|$)
+^(dev|fd|net.*|srv|shr|env|root|proc|boot|mnt|n|bin|usr|cfg|cron|mail|tmp)(/|$)
 ^386/(9(pc|boot).*|pbs|mbr|init)
 ^acme/bin/(386|68000|68020|alpha|amd64|arm|power|power64|sparc|sparc64)(/|$)
 ^adm/(cache|keys|netkeys|secstore|users|whois|timezone/local)(/|$)