diff --git a/src/generic/GenericTypes.jl b/src/generic/GenericTypes.jl
index 67bd41133..cddd5985f 100644
--- a/src/generic/GenericTypes.jl
+++ b/src/generic/GenericTypes.jl
@@ -347,7 +347,7 @@ end
    function MPolyRing{T}(R::Ring, s::Vector{Symbol}, ord::Symbol, N::Int,
                          cached::Bool = true) where T <: RingElement
       return get_cached!(MPolyID, (R, s, ord, N), cached) do
-         new{T}(R, s, ord, length(s), N, is_zero(one(R)))
+         new{T}(R, s, ord, length(s), N, is_trivial(R))
       end::MPolyRing{T}
    end
 end