diff --git a/libnetwork/resolvconf/dns/resolvconf.go b/libnetwork/resolvconf/dns/resolvconf.go
index d581a1913d..f981b1fc85 100644
--- a/libnetwork/resolvconf/dns/resolvconf.go
+++ b/libnetwork/resolvconf/dns/resolvconf.go
@@ -5,7 +5,7 @@ import (
 )
 
 // IPLocalhost is a regex patter for localhost IP address range.
-const IPLocalhost = `((127\.([0-9]{1,3}.){2}[0-9]{1,3})|(::1))`
+const IPLocalhost = `((127\.([0-9]{1,3}\.){2}[0-9]{1,3})|(::1))`
 
 var localhostIPRegexp = regexp.MustCompile(IPLocalhost)