diff --git a/src/Quantum.jl b/src/Quantum.jl
index 533cedb0f..5ce9751a1 100644
--- a/src/Quantum.jl
+++ b/src/Quantum.jl
@@ -108,7 +108,7 @@ Returns the sites of a [`Quantum`](@ref) Tensor Network.
 """
 function sites(tn::Quantum; kwargs...)
     if isempty(kwargs)
-        collect(keys(tn.sites))
+        sort!(collect(keys(tn.sites)))
     elseif keys(kwargs) === (:at,)
         findfirst(i -> i === kwargs[:at], tn.sites)
     else