diff --git a/src/classical/chebyshev.jl b/src/classical/chebyshev.jl
index 90a82d3..5d4b479 100644
--- a/src/classical/chebyshev.jl
+++ b/src/classical/chebyshev.jl
@@ -296,28 +296,33 @@ end
 # sum
 ####
 
-function _sum(::Weighted{T,<:ChebyshevU}, dims) where T
+function _sum(::Weighted{T,<:ChebyshevU}, dims::Int) where T
     @assert dims == 1
     Hcat(convert(T, π)/2, Zeros{T}(1,∞))
 end
 
 # Same normalization for T,V,W
-function _sum(::Weighted{T,<:Chebyshev}, dims) where T
+function _sum(::Weighted{T,<:ChebyshevT}, dims::Int) where T
     @assert dims == 1
     Hcat(convert(T, π), Zeros{T}(1,∞))
 end
 
-function _cumsum(T::ChebyshevT{V}, dims) where V
+function _cumsum(T::ChebyshevT{V}, dims::Int) where V
     @assert dims == 1
     Σ = _BandedMatrix(Vcat(-one(V) ./ (-2:2:∞)', Zeros{V}(1,∞), Hcat(one(V), one(V) ./ (4:2:∞)')), ℵ₀, 0, 2)
     ApplyQuasiArray(*, T, Vcat((-1).^(0:∞)'* Σ, Σ))
 end
 
-function _cumsum(W::Weighted{V, ChebyshevT{V}}, dims) where V
+function _cumsum(W::Weighted{V, ChebyshevT{V}}, dims::Int) where V
     @assert dims == 1
     [cumsum(ChebyshevTWeight{V}()) Weighted(ChebyshevU{V}())] * Diagonal(Vcat(one(V), -inv.(one(V):∞)))
 end
 
+function _sum(::ChebyshevT{T}, dims::Int) where T
+    @assert dims == 1
+    permutedims(vec(Hcat(Vcat(2one(T), -(2one(T)) ./ ((3:2:∞) .* (1:2:∞))), Zeros{T}(∞))'))
+end 
+
 ####
 # algebra
 ####
diff --git a/src/classical/jacobi.jl b/src/classical/jacobi.jl
index 022e3a2..bb26390 100644
--- a/src/classical/jacobi.jl
+++ b/src/classical/jacobi.jl
@@ -635,6 +635,6 @@ end
 # sum
 ###
 
-_sum(P::AbstractJacobi{T}, dims) where T = 2 * (Legendre{T}() \ P)[1:1,:]
+_sum(P::AbstractJacobi{T}, dims::Int) where T = 2 * (Legendre{T}() \ P)[1:1,:]
 
 
diff --git a/src/classical/legendre.jl b/src/classical/legendre.jl
index ec4154f..2d56d30 100644
--- a/src/classical/legendre.jl
+++ b/src/classical/legendre.jl
@@ -254,7 +254,7 @@ end
 # sum
 ###
 
-function _sum(P::Legendre{T}, dims) where T
+function _sum(P::Legendre{T}, dims::Int) where T
     @assert dims == 1
     Hcat(convert(T, 2), Zeros{T}(1,∞))
 end
diff --git a/src/interlace.jl b/src/interlace.jl
index e72d254..b85f7b6 100644
--- a/src/interlace.jl
+++ b/src/interlace.jl
@@ -272,7 +272,7 @@ end
 # sum
 ###
 
-_sum(P::PiecewiseInterlace, dims) = BlockBroadcastArray(hcat, unitblocks.(_sum.(P.args, dims))...)
+_sum(P::PiecewiseInterlace, dims::Int) = BlockBroadcastArray(hcat, unitblocks.(_sum.(P.args, dims))...)
 
 # blockvector2vectortuple