diff --git a/lib/functional.rb b/lib/functional.rb
index 37edbb9..2100835 100644
--- a/lib/functional.rb
+++ b/lib/functional.rb
@@ -186,7 +186,7 @@ class Functional
 	end
 
 	class Reduce <Base
-		def initialize iv, *a, &exe
+		def initialize iv, *a, &e
 			super *a, &e
 			@buf = {}
 			@buf.default = iv