diff --git a/test/common_interface/callbacks.jl b/test/common_interface/callbacks.jl
index 4f5c993..ff540e8 100644
--- a/test/common_interface/callbacks.jl
+++ b/test/common_interface/callbacks.jl
@@ -55,7 +55,7 @@ function condition2(u, t, integrator)
 end
 affect2!(integrator) = terminate!(integrator)
 times_finalize_called = 0
-cb = DiscreteCallback(condition2, affect2!, finalize=(args...)->times_finalize_called+=1)
+cb = DiscreteCallback(condition2, affect2!, finalize=(args...)->global times_finalize_called+=1)
 sol = solve(prob, CVODE_BDF(); callback = cb)
 @test sol.t[end] < 3.5
 @test times_finalize_called = 1