diff --git a/test/lib/lib.jl b/test/lib/lib.jl
index 0886b9969..11e64cba9 100644
--- a/test/lib/lib.jl
+++ b/test/lib/lib.jl
@@ -4,5 +4,6 @@
         t2 = (a=1, b=2)
         @test Zygote.accum(t1, t2) == (a = 2, b = 4, c = 3)
         @test_throws ArgumentError Zygote.accum(t2, t1)
+        @test Zygote.accum(fill(0.0), fill(0.0)) == fill(0.0)
     end
 end