diff --git a/lib/algae/reader.ex b/lib/algae/reader.ex
index 5e36724..b37212c 100644
--- a/lib/algae/reader.ex
+++ b/lib/algae/reader.ex
@@ -127,7 +127,7 @@ defmodule Algae.Reader do
   @spec ask((any() -> any())) :: t()
   def ask(fun) do
     monad %Reader{} do
-      e <- ask
+      e <- ask()
       return fun.(e)
     end
   end