diff --git a/lib/OptimizationMOI/test/runtests.jl b/lib/OptimizationMOI/test/runtests.jl
index b474c6de8..ba04cae51 100644
--- a/lib/OptimizationMOI/test/runtests.jl
+++ b/lib/OptimizationMOI/test/runtests.jl
@@ -36,7 +36,7 @@ end
 
     optprob = OptimizationFunction((x, p) -> -rosenbrock(x, p), Optimization.AutoZygote())
     prob = OptimizationProblem(optprob, x0, _p; sense = Optimization.MaxSense)
-    iter = 0
+    global iter = 0
     callback = function (p, l)
         global iter
         iter += 1