diff --git a/src/operators.jl b/src/operators.jl
index fdd2fd4..aa14e65 100644
--- a/src/operators.jl
+++ b/src/operators.jl
@@ -154,8 +154,9 @@ function MA.operate!(
         push!(p.a, t[1])
         return push!(p.x.Z, t[2])
     end
-    compare_monomials(t::_NoVarTerm, j::Int) = _exponents_compare(q, j, t[2])
-    compare_monomials(i::Int, j::Int) = compare_monomials(get1(i), j)
+    compare_monomials_impl(t, j) = _exponents_compare(q, j, t[2])
+    compare_monomials(t::_NoVarTerm, j::Int) = compare_monomials_impl(t, j)
+    compare_monomials(i::Int, j::Int) = compare_monomials_impl(get1(i), j)
     combine(i::Int, j::Int) = p.a[i] = MA.operate!!(op, p.a[i], q.a[j])
     combine(t::_NoVarTerm, j::Int) = (MA.operate!!(op, t[1], q.a[j]), t[2])
     function resize(n)