diff --git a/src/butterflylu.jl b/src/butterflylu.jl
index ed85207..b52c8e6 100644
--- a/src/butterflylu.jl
+++ b/src/butterflylu.jl
@@ -1,5 +1,5 @@
 using VectorizedRNG
-using LinearAlgebra: Diagonal, I
+using LinearAlgebra: Diagonal, I, mul!
 using LoopVectorization
 using RecursiveFactorization
 using SparseBandedMatrices