diff --git a/src/build_function.jl b/src/build_function.jl
index b19b9ca043..946226d3cd 100644
--- a/src/build_function.jl
+++ b/src/build_function.jl
@@ -207,7 +207,7 @@ function _build_function(target::JuliaTarget, rhss::AbstractArray, args...;
     end
 
     out = Sym{Any}(gensym("out"))
-    ip_expr = Func([out, dargs...], [], _set_array(out, outputidxs, rhss, skipzeros))
+    ip_expr = Func([out, dargs...], [], _set_array(out, outputidxs, rhss, checkbounds, skipzeros))
 
     if !isnothing(wrap_code[2])
         ip_expr = wrap_code[2](ip_expr)
@@ -231,18 +231,18 @@ function _make_array(rhss::AbstractSparseArray, similarto)
 end
 
 ## In-place version
-function _set_array(out, outputidxs, rhss::AbstractArray, skipzeros)
+function _set_array(out, outputidxs, rhss::AbstractArray, checkbounds, skipzeros)
     if rhss isa Union{SparseVector, SparseMatrixCSC}
-        return SetArray(false, LiteralExpr(:($out.nzval)), rhss.nzval)
-    elseif isnothing(outputidxs)
+        return SetArray(checkbounds, LiteralExpr(:($out.nzval)), rhss.nzval)
+    elseif outputidxs === nothing
         outputidxs = collect(eachindex(rhss))
     end
 
     # sometimes outputidxs is a Tuple
-    ii = findall(i->!(rhss[i] isa AbstractArray) && !(skipzeros && iszero(rhss[i])), outputidxs)
-    jj = findall(i->rhss[i] isa AbstractArray, outputidxs)
+    ii = findall(i->!(rhss[i] isa AbstractArray) && !(skipzeros && _iszero(rhss[i])), eachindex(outputidxs))
+    jj = findall(i->rhss[i] isa AbstractArray, eachindex(outputidxs))
     exprs = []
-    push!(exprs, SetArray(false, out, AtIndex.(vec(collect(outputidxs[ii])), vec(rhss[ii]))))
+    push!(exprs, SetArray(checkbounds, out, AtIndex.(vec(collect(outputidxs[ii])), vec(rhss[ii]))))
     for j in jj
         push!(exprs, _set_array(LiteralExpr(:($out[$j])), nothing, rhss[j], skipzeros))
     end
@@ -251,7 +251,7 @@ function _set_array(out, outputidxs, rhss::AbstractArray, skipzeros)
                 end)
 end
 
-_set_array(out, outputidxs, rhs, skipzeros) = rhs
+_set_array(out, outputidxs, rhs, checkbounds, skipzeros) = rhs
 
 
 function _make_array(rhss::AbstractArray, similarto)
diff --git a/test/runtests.jl b/test/runtests.jl
index 45ebea3490..8be142e333 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,33 +1,33 @@
 using SafeTestsets, Test
 
-# @safetestset "Parsing Test" begin include("variable_parsing.jl") end
-# @safetestset "Differentiation Test" begin include("derivatives.jl") end
-# @safetestset "Simplify Test" begin include("simplify.jl") end
-# @safetestset "Operation Overloads Test" begin include("operation_overloads.jl") end
-# @safetestset "Direct Usage Test" begin include("direct.jl") end
-# @safetestset "System Linearity Test" begin include("linearity.jl") end
-# @safetestset "Build Function Test" begin include("build_function.jl") end
-# @safetestset "ODESystem Test" begin include("odesystem.jl") end
-# @safetestset "LabelledArrays Test" begin include("labelledarrays.jl") end
-# @safetestset "Mass Matrix Test" begin include("mass_matrix.jl") end
-# @safetestset "SteadyStateSystem Test" begin include("steadystatesystems.jl") end
-# @safetestset "SDESystem Test" begin include("sdesystem.jl") end
-# @safetestset "NonlinearSystem Test" begin include("nonlinearsystem.jl") end
-# @safetestset "OptimizationSystem Test" begin include("optimizationsystem.jl") end
-# @safetestset "ReactionSystem Test" begin include("reactionsystem.jl") end
-# @safetestset "JumpSystem Test" begin include("jumpsystem.jl") end
-# @safetestset "ControlSystem Test" begin include("controlsystem.jl") end
-# @safetestset "Build Targets Test" begin include("build_targets.jl") end
-# @safetestset "Domain Test" begin include("domains.jl") end
-# @safetestset "Modelingtoolkitize Test" begin include("modelingtoolkitize.jl") end
-# @safetestset "Constraints Test" begin include("constraints.jl") end
-# @safetestset "Reduction Test" begin include("reduction.jl") end
-# @safetestset "Components Test" begin include("components.jl") end
-# @safetestset "PDE Construction Test" begin include("pde.jl") end
-# @safetestset "Lowering Integration Test" begin include("lowering_solving.jl") end
-# @safetestset "Test Big System Usage" begin include("bigsystem.jl") end
-# @safetestset "Depdendency Graph Test" begin include("dep_graphs.jl") end
-# @safetestset "Function Registration Test" begin include("function_registration.jl") end
+@safetestset "Parsing Test" begin include("variable_parsing.jl") end
+@safetestset "Differentiation Test" begin include("derivatives.jl") end
+@safetestset "Simplify Test" begin include("simplify.jl") end
+@safetestset "Operation Overloads Test" begin include("operation_overloads.jl") end
+@safetestset "Direct Usage Test" begin include("direct.jl") end
+@safetestset "System Linearity Test" begin include("linearity.jl") end
+@safetestset "Build Function Test" begin include("build_function.jl") end
+@safetestset "ODESystem Test" begin include("odesystem.jl") end
+@safetestset "LabelledArrays Test" begin include("labelledarrays.jl") end
+@safetestset "Mass Matrix Test" begin include("mass_matrix.jl") end
+@safetestset "SteadyStateSystem Test" begin include("steadystatesystems.jl") end
+@safetestset "SDESystem Test" begin include("sdesystem.jl") end
+@safetestset "NonlinearSystem Test" begin include("nonlinearsystem.jl") end
+@safetestset "OptimizationSystem Test" begin include("optimizationsystem.jl") end
+@safetestset "ReactionSystem Test" begin include("reactionsystem.jl") end
+@safetestset "JumpSystem Test" begin include("jumpsystem.jl") end
+@safetestset "ControlSystem Test" begin include("controlsystem.jl") end
+@safetestset "Build Targets Test" begin include("build_targets.jl") end
+@safetestset "Domain Test" begin include("domains.jl") end
+@safetestset "Modelingtoolkitize Test" begin include("modelingtoolkitize.jl") end
+@safetestset "Constraints Test" begin include("constraints.jl") end
+@safetestset "Reduction Test" begin include("reduction.jl") end
+@safetestset "Components Test" begin include("components.jl") end
+@safetestset "PDE Construction Test" begin include("pde.jl") end
+@safetestset "Lowering Integration Test" begin include("lowering_solving.jl") end
+@safetestset "Test Big System Usage" begin include("bigsystem.jl") end
+@safetestset "Depdendency Graph Test" begin include("dep_graphs.jl") end
+@safetestset "Function Registration Test" begin include("function_registration.jl") end
 @safetestset "Array of Array Test" begin include("build_function_arrayofarray.jl") end
 @testset "Distributed Test" begin include("distributed.jl") end
 @safetestset "Variable Utils Test" begin include("variable_utils.jl") end