diff --git a/stdlib/SuiteSparse/test/umfpack.jl b/stdlib/SuiteSparse/test/umfpack.jl
index 12ce4c9bddac4b..356c0cf3fa4e73 100644
--- a/stdlib/SuiteSparse/test/umfpack.jl
+++ b/stdlib/SuiteSparse/test/umfpack.jl
@@ -178,7 +178,7 @@ using LinearAlgebra: Adjoint, Transpose, SingularException
     end
 
     @testset "deserialization" begin
-        A  = sprandn(10, 10, 0.4)
+        A  = 10*I + sprandn(10, 10, 0.4)
         F1 = lu(A)
         b  = IOBuffer()
         serialize(b, F1)