diff --git a/src/TensorNetwork.jl b/src/TensorNetwork.jl
index 9dac01997..8b8676674 100644
--- a/src/TensorNetwork.jl
+++ b/src/TensorNetwork.jl
@@ -438,7 +438,7 @@ function Base.replace!(tn::AbstractTensorNetwork, pair::Pair{<:Tensor,<:Tensor})
     tn = TensorNetwork(tn)
     old_tensor, new_tensor = pair
 
-    old_tensor == new_tensor && return tn
+    old_tensor === new_tensor && return tn
 
     issetequal(inds(new_tensor), inds(old_tensor)) || throw(ArgumentError("replacing tensor indices don't match"))