diff --git a/test/test_example_acoeffs.jl b/test/test_example_acoeffs.jl
index 60d5291..84d2857 100644
--- a/test/test_example_acoeffs.jl
+++ b/test/test_example_acoeffs.jl
@@ -26,6 +26,6 @@ end
 Base.getindex(ac::ACoeffs, idx) = ac.vals[idx]
 Base.setindex!(ac::ACoeffs, val, idx) = ac.vals[idx] = val
 function SA.unsafe_push!(ac::ACoeffs, idx, val)
-    ac.vals[idx] = val
+    ac.vals[idx] = MA.add!!(ac.vals[idx], val)
     return ac
 end