diff --git a/src/extras/spectral_normalization.jl b/src/extras/spectral_normalization.jl
index e1acab7..ea93f72 100644
--- a/src/extras/spectral_normalization.jl
+++ b/src/extras/spectral_normalization.jl
@@ -62,7 +62,7 @@ struct ConvSN{N,M,F,A,V, I<:Int, VV<:AbstractArray}
   u::VV # Left vector for power iteration
 end
 
-function ConvSN(w::AbstractArray{T,N}, b::Union{Flux.Zeros, AbstractVector{T}}, σ = identity;
+function ConvSN(w::AbstractArray{T,N}, b, σ = identity;
               stride = 1, pad = 0, dilation = 1, n_iterations = 1) where {T,N}
   stride = Flux.expand(Val(N-2), stride)
   dilation = Flux.expand(Val(N-2), dilation)
@@ -73,7 +73,7 @@ end
 
 function ConvSN(k::NTuple{N,Integer}, ch::Pair{<:Integer,<:Integer}, σ = identity;
             init = Flux.glorot_uniform,  stride = 1, pad = 0, dilation = 1,
-            weight = Flux.convfilter(k, ch, init = init), bias = Flux.zeros(ch[2]), n_iterations = 1) where N
+            weight = Flux.convfilter(k, ch, init = init), bias = zeros(ch[2]), n_iterations = 1) where N
   ConvSN(weight, bias, σ, stride = stride, pad = pad, dilation = dilation, n_iterations = n_iterations)
 end