diff --git a/frontends/ParseOccam.hs b/frontends/ParseOccam.hs
index 7a1da5d..f297308 100644
--- a/frontends/ParseOccam.hs
+++ b/frontends/ParseOccam.hs
@@ -532,7 +532,7 @@ timerType
 
 portType :: OccParser A.Type
 portType
-    =   do { sPORT; sOF; p <- dataType; return $ A.Port p }
+    =   do { sPORT; optional sOF; p <- dataType; return $ A.Port p }
     <|> arrayType portType
     <?> "port type"
 --}}}