diff --git a/test/test_cudss.jl b/test/test_cudss.jl
index da6942e..001e816 100644
--- a/test/test_cudss.jl
+++ b/test/test_cudss.jl
@@ -546,10 +546,10 @@ function iterative_refinement()
     return norm(r_gpu)
   end
 
-  n = 1000
+  n = 100
   @testset "precision = $T" for T in (Float32, Float64, ComplexF32, ComplexF64)
     R = real(T)
-    @testset "number of iterative refinement: $ir" for ir in (1, 2)
+    @testset "number of iterative refinement: $ir" for ir in (0, 1, 2)
       @testset "LU" begin
         A_cpu = sprand(T, n, n, 0.05) + I
         x_cpu = zeros(T, n)