diff --git a/test/common_interface/iterators.jl b/test/common_interface/iterators.jl
index cb2ff22..b2b1a12 100644
--- a/test/common_interface/iterators.jl
+++ b/test/common_interface/iterators.jl
@@ -25,11 +25,11 @@ u2 = copy(integrator.u)
 @test u1 != vec(prob.u0)
 @test u1 == u2
 
-f(u, p, t) = [2 * u[1]]
+f_terminate(u, p, t) = [2 * u[1]]
 u_positive(u, t, integrator) = u[1] > 0
 terminate_if_u_pos = DiscreteCallback(u_positive, terminate!)
 
-prob = ODEProblem(f, [1.0], (0.0, 1.0)) # positive initial condition > positive u > :Terminated
+prob = ODEProblem(f_terminate, [1.0], (0.0, 1.0)) # positive initial condition > positive u > :Terminated
 integrator = init(prob, CVODE_BDF(), callback=terminate_if_u_pos)
 sol1 = solve!(integrator)
 @test sol1.retcode === :Terminated
@@ -38,7 +38,7 @@ reinit!(integrator, [-1.0]) # negative initial condition > negative u > :Success
 sol2 = solve!(integrator)
 @test sol2.retcode == :Success
 
-prob = ODEProblem(f, [-1.0], (0.0, 1.0)) # negative initial condition > negative u > :Success!
+prob = ODEProblem(f_terminate, [-1.0], (0.0, 1.0)) # negative initial condition > negative u > :Success!
 integrator = init(prob, CVODE_BDF(), callback=terminate_if_u_pos)
 sol3 = solve!(integrator)
 @test sol3.retcode == :Success
\ No newline at end of file