diff --git a/NDTensors/src/DiagonalArrays/src/DiagonalArrays.jl b/NDTensors/src/DiagonalArrays/src/DiagonalArrays.jl
index 6d4ceb8310..45319ad8ce 100644
--- a/NDTensors/src/DiagonalArrays/src/DiagonalArrays.jl
+++ b/NDTensors/src/DiagonalArrays/src/DiagonalArrays.jl
@@ -1,5 +1,6 @@
 module DiagonalArrays
 
+using Compat # allequal
 using LinearAlgebra
 
 export DiagonalArray