diff --git a/julia/gilded_rose.jl b/julia/gilded_rose.jl
index ae0c5c80..b17d20c9 100644
--- a/julia/gilded_rose.jl
+++ b/julia/gilded_rose.jl
@@ -1,6 +1,6 @@
 import Base
 
-mutable struct Item{T<:Real}
+mutable struct Item{T<:Integer}
     name::String
     sellin::T
     quality::T