diff --git a/benchmark.jl b/benchmark.jl
index 12c1b9f..5ed311d 100644
--- a/benchmark.jl
+++ b/benchmark.jl
@@ -15,7 +15,7 @@ end
 
 T=Float32
 
-function V_test(r2::T)::T
+function V_test(r2)
     return -4*exp(-r2/4)
 end
 
@@ -31,7 +31,7 @@ n_image=1
 
 for L::T in 5.0:14.0
     println("Constructing H operator...")
-    @time H=HOperator{T}(V_test,3,3,N,L,convert(T,μ),n_image)
+    @time H=HOperator{T}(V_test,3,3,N,L,convert(T,0),convert(T,μ),n_image)
     println("Applying H 1000 times...")
     if GPU_mode
         v=CUDA.rand(Complex{T},vectorDims(H)...)