diff --git a/src/conversion.jl b/src/conversion.jl
index 5d513b4c..20b54702 100644
--- a/src/conversion.jl
+++ b/src/conversion.jl
@@ -60,9 +60,8 @@ function Base.convert(::Type{T}, p::AbstractPolynomial) where T <: AbstractTermL
 end
 
 MA.scaling(p::AbstractPolynomialLike{T}) where {T} = convert(T, p)
-Base.convert(::Type{Any}, p::APL) = p
 # Conversion polynomial -> scalar
-function Base.convert(S::Type{<:Union{Number, T}}, p::APL{T}) where T
+function Base.convert(S::Type{<:Union{Number, T}}, p::APL{T}) where T<:Number
     s = zero(S)
     for t in terms(p)
         if !isconstant(t)