diff --git a/src/ma.jl b/src/ma.jl
index c4a8ca9..61673be 100644
--- a/src/ma.jl
+++ b/src/ma.jl
@@ -28,7 +28,7 @@ wma(x::Array{T}; n::Int64=10, wts::Array{T}=collect(1:n)/sum(1:n))::Array{Float6
 
 Weighted moving average (WMA)
 """
-function wma(x::AbstractArray{T}; n::Int64=10, wts::AbstractArray{T}=collect(1:n)/sum(1:n)) where {T<:Real}
+function wma(x::AbstractArray{<:Real}; n::Int64=10, wts::AbstractArray{<:Real}=collect(1:n)/sum(1:n))
     @assert n<size(x,1) && n>0 "Argument n out of bounds"
     out = fill(NaN, size(x,1))
     @inbounds for i = n:size(x,1)
diff --git a/test/ma.jl b/test/ma.jl
index e711d95..fdb8b6f 100644
--- a/test/ma.jl
+++ b/test/ma.jl
@@ -119,4 +119,9 @@
         @test size(tmp, 1) == N
         @test size(tmp, 2) == 1           
     end
+    @testset "wma" begin
+        @test isequal(wma(ones(Real, 4); n=2, wts=fill(0.5, 2)), [NaN, 1, 1, 1])
+        @test isequal(wma(ones(Float64, 4); n=2, wts=fill(0.5, 2)), [NaN, 1, 1, 1])
+        @test isequal(wma(ones(Int64, 4); n=2, wts=ones(Float64, 2)), [NaN, 2, 2, 2])
+    end
 end