diff --git a/patterns/grok-patterns b/patterns/grok-patterns
index ef0cef59a..2345ace06 100755
--- a/patterns/grok-patterns
+++ b/patterns/grok-patterns
@@ -32,7 +32,7 @@ HOSTPORT (?:%{IPORHOST=~/\./}:%{POSINT})
 PATH (?:%{UNIXPATH}|%{WINPATH})
 UNIXPATH (?>/(?>[\w_%!$@:.,-]+|\\.)*)+
 #UNIXPATH (?<![\w\/])(?:/[^\/\s?*]*)+
-TTY (?:/dev/(pts|tty([pq])?(\w+)?)(/%{NONNEGINT}))
+TTY (?:/dev/(pts|tty([pq])?(\w+)?)(/)?(%{NONNEGINT}))
 WINPATH (?>[A-Za-z]+:|\\)(?:\\[^\\?*]*)+
 URIPROTO [A-Za-z]+(\+[A-Za-z+]+)?
 URIHOST %{IPORHOST}(?::%{POSINT:port})?