diff --git a/src/utils.jl b/src/utils.jl
index d1657e4..a834476 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -24,18 +24,15 @@ end
 
 
 """
-    scale_sobol_seq!(sequence::AbstractArray{<:Number, N}, dists::AbstractArray{Distribution, N})
+    scale_sobol_seq!(sequence::AbstractArray{<:Number, N}, dists::AbstractArray{T, N})
 
 Rescale a Sobol `sequence` of parameters from the 0-to-1 range to their corresponding 
 univeariate distributions `dists`.  
 """
-function scale_sobol_seq!(sequence::AbstractArray{<:Number, N1}, dists::AbstractArray{<:Distribution, N2}) where N1 where N2
+function scale_sobol_seq!(sequence::AbstractArray{<:Number, N1}, dists::AbstractArray{T, N2}) where T where N1 where N2
     D = length(dists) # number of parameters
     for param in 1:D
         dist = dists[param]
-        if !(typeof(dist) <: UnivariateDistribution)
-            error("Distribution must be a subtype of UnivariateDistribution")
-        end
         sequence[:, [param, param + D]] = quantile.(dist, sequence[:, [param, param + D]])
     end
 end