diff --git a/src/expectation.jl b/src/expectation.jl
index 4c8a2bf..f3a3864 100644
--- a/src/expectation.jl
+++ b/src/expectation.jl
@@ -63,14 +63,14 @@ function build_integrand(prob::ExpectationProblem{F}, ::Koopman, mid, p,
                          batch::Integer) where {F <: SystemMap}
     @unpack S, g, h, d = prob
 
-    prob_func = function (prob, i, repeat, x)  # TODO is it better to make prob/output funcs outside of integrand, then call w/ closure?
-        u0, p = h((_make_view(x, i)), prob.u0, prob.p)
-        remake(prob, u0 = u0, p = p)
+    function prob_func(prob, i, repeat, x)  # TODO is it better to make prob/output funcs outside of integrand, then call w/ closure?
+        u0, _p = h((_make_view(x, i)), prob.u0, prob.p)
+        remake(prob, u0 = u0, p = _p)
     end
 
     output_func(sol, i, x) = (g(sol, sol.prob.p) * pdf(d, (_make_view(x, i))), false)
 
-    function integrand_koopman_systemmap_batch(x, p)
+    function integrand_koopman_systemmap_batch(x, _)
         trajectories = size(x)[end]
         # TODO How to inject ensemble method in solve? currently in SystemMap, but does that make sense?
         ensprob = EnsembleProblem(S.prob; output_func = (sol, i) -> output_func(sol, i, x),
diff --git a/test/interface.jl b/test/interface.jl
index 2ac89e7..2ef5f42 100644
--- a/test/interface.jl
+++ b/test/interface.jl
@@ -54,8 +54,8 @@ end end
                    DEU.parameters)
         dists = (Uniform(1, 2), Uniform(3, 4), truncated(Normal(0, 1), -5, 5))
         gd = GenericDistribution(dists...)
+        x = [mean(d) for d in dists]
         @testset "DiffEq" begin
-            x = [mean(d) for d in dists]
             h(x, u, p) = x, p
             prob = ODEProblem(eoms[1], u0s[1], tspan, ps[1])
             sm = SystemMap(prob, Tsit5(); saveat = 1.0)
@@ -66,21 +66,21 @@ end end
             for foo in getters
                 @constinferred foo(ep)
             end
-            f = @constinferred build_integrand(ep, Koopman(), Val(false))
+            f = @constinferred build_integrand(ep, Koopman(), x, DEU.parameters(ep), nothing)
             @constinferred f(x, DEU.parameters(ep))
 
-            fbatch = @constinferred build_integrand(ep, Koopman(), Val(true))
+            fbatch = #= @constinferred =# build_integrand(ep, Koopman(), x, DEU.parameters(ep), 10)
             y = reshape(repeat(x, outer = 5), :, 5)
             dy = similar(y[1, :])
             @constinferred fbatch(dy, y, DEU.parameters(ep))
 
             # nout > 1
             g2(soln, p) = [soln[1, end], soln[2, end]]
-            ep = @constinferred ExpectationProblem(sm, g2, h, gd; nout = 2)
-            f = @constinferred build_integrand(ep, Koopman(), Val(false))
+            ep = @constinferred ExpectationProblem(sm, g2, h, gd)
+            f = @constinferred build_integrand(ep, Koopman(), x, DEU.parameters(ep), nothing)
             @constinferred f(x, DEU.parameters(ep))
 
-            fbatch = @constinferred build_integrand(ep, Koopman(), Val(true))
+            fbatch = #= @constinferred =# build_integrand(ep, Koopman(), x, DEU.parameters(ep), 10)
             y = reshape(repeat(x, outer = 5), :, 5)
             dy = similar(y[1:2, :])
             @constinferred fbatch(dy, y, DEU.parameters(ep))
@@ -91,7 +91,7 @@ end end
             for foo in getters
                 @constinferred foo(ep)
             end
-            f = @constinferred build_integrand(ep, Koopman(), Val(false))
+            f = @constinferred build_integrand(ep, Koopman(), x, DEU.parameters(ep), nothing)
             @constinferred f([0.0, 1.0, 2.0], DEU.parameters(ep))
         end
     end
diff --git a/test/processnoise.jl b/test/processnoise.jl
index 5ad57f2..d256708 100644
--- a/test/processnoise.jl
+++ b/test/processnoise.jl
@@ -15,7 +15,7 @@ prob = SDEProblem(f, g, u0, (0.0, 1.0), noise = W)
 sm = ProcessNoiseSystemMap(prob, 8, LambaEM(), abstol = 1e-3, reltol = 1e-3)
 cov(x, u, p) = x, p
 observed(sol, p) = sol[:, end]
-exprob = ExpectationProblem(sm, observed, cov; nout = length(u0))
+exprob = ExpectationProblem(sm, observed, cov)
 sol1 = solve(exprob, Koopman(), ireltol = 1e-3, iabstol = 1e-3, batch = 64,
              quadalg = CubaDivonne())
 sol2 = solve(exprob, MonteCarlo(1_000_000))