diff --git a/src/ITensorMPS.jl b/src/ITensorMPS.jl
index a9f1874..2c81638 100644
--- a/src/ITensorMPS.jl
+++ b/src/ITensorMPS.jl
@@ -5,7 +5,7 @@ using ITensorTDVP: ITensorTDVP
 const alternating_update_dmrg = ITensorTDVP.dmrg
 # Not re-exported, but this makes these types and functions accessible
 # as `ITensorMPS.x`.
-using ITensors.ITensorMPS: AbstractMPS, sortmergeterms
+using ITensors.ITensorMPS: AbstractSum, sortmergeterms
 @reexport using ITensors.ITensorMPS:
   @OpName_str,
   @SiteType_str,