diff --git a/test/copy.jl b/test/copy.jl
index da744e456a490..f5cc57c86feaa 100644
--- a/test/copy.jl
+++ b/test/copy.jl
@@ -259,6 +259,7 @@ end
     p[1] = p
     p2 = deepcopy(p)
     @test p2 === p2[1]
+    @test p2 !== p
 end
 
 @testset "deepcopy_internal arrays" begin