diff --git a/src/Dhall/Parser.hs b/src/Dhall/Parser.hs
index 33cfb4e..c3a6075 100644
--- a/src/Dhall/Parser.hs
+++ b/src/Dhall/Parser.hs
@@ -137,6 +137,10 @@ expr = mdo
             <$> some letExpr
             <*> (match Lexer.In *> expr)
             )
+        <|> (   Annot
+            <$> bexpr
+            <*> (match Lexer.Colon *> expr)
+            )
         )
 
     letExpr <- rule