diff --git a/Main.hs b/Main.hs
index 300474a..b384b2c 100644
--- a/Main.hs
+++ b/Main.hs
@@ -5,6 +5,4 @@ import System.Environment
 main :: IO ()
 main = do
   a <- getArgs
-  case null a of
-    False -> makeGUI (head a)
-    True  -> makeGUI ""
+  makeGUI (if null a then head a else "")
diff --git a/Parser.hs b/Parser.hs
index 915173b..d783c13 100644
--- a/Parser.hs
+++ b/Parser.hs
@@ -17,7 +17,7 @@ newtype Parser a = MkParser { runParser :: String -> Maybe (a, String) }
 
 -- |Functor instance.
 instance Functor Parser where
-  fmap f p = (inParser . fmap . fmap . first $ f) p
+  fmap = inParser . fmap . fmap . first
 
 -- |Applicative functor instance.
 instance Applicative Parser where