diff --git a/src/colors.jl b/src/colors.jl
index 45bb5d3..737eead 100644
--- a/src/colors.jl
+++ b/src/colors.jl
@@ -21,7 +21,7 @@ plot_color(s::Symbol, α::Number) = (iscgrad_symbol(s) ? cgrad(s, alpha=α) : RG
 plot_color(grad::ColorGradient, α::Number) = cgrad(grad, alpha=α)
 
 function plot_color(cs::AbstractArray)
-    a = Array{RGBA{Float64}}(undef, size(cs))
+    a = Array{RGBA{Float64}}(undef, size(cs)...)
     for i in eachindex(cs)
         a[i] = plot_color(cs[i])
     end
@@ -30,7 +30,7 @@ end
 
 # plot_color(cs::AbstractVector, α::Number) = RGBA{Float64}[plot_color(c,α) for c in cs]
 function plot_color(cs::AbstractArray, α::Number)
-    a = Array{RGBA{Float64}}(undef, size(cs))
+    a = Array{RGBA{Float64}}(undef, size(cs)...)
     for i in eachindex(cs)
         a[i] = plot_color(cs[i], α)
     end
@@ -49,7 +49,7 @@ end
 function plot_color(zs::AbstractArray{T}) where T<:Number
     grad = cgrad()
     zmin, zmax = extrema(zs[isfinite.(zs)])
-    a = Array{RGBA{Float64}}(undef, size(zs))
+    a = Array{RGBA{Float64}}(undef, size(zs)...)
     for i in eachindex(zs)
         a[i] = grad[(zs[i]-zmin)/(zmax-zmin)]
     end
@@ -62,7 +62,7 @@ end
 # end
 function plot_color(zs::AbstractArray{T}, α::Number) where T<:Number
     cs = plot_color(zs)
-    a = Array{RGBA{Float64}}(undef, size(zs))
+    a = Array{RGBA{Float64}}(undef, size(zs)...)
     for i in eachindex(zs)
         a[i] = RGBA{Float64}(convert(RGB, cs[i]), α)
     end
diff --git a/src/ticks.jl b/src/ticks.jl
index ce2621a..ae73568 100644
--- a/src/ticks.jl
+++ b/src/ticks.jl
@@ -106,7 +106,7 @@ function optimize_ticks_typed(x_min::T, x_max::T, extend_ticks,
                 while r*stp * one_t <= x_min
                     # Filter or expand ticks
                     if extend_ticks
-                        S = Array{typeof(1.0 * one_t)}(Int(3 * k))
+                        S = Array{typeof(1.0 * one_t)}(undef, Int(3 * k))
                         for i in 0:(3*k - 1)
                             S[i+1] = (r + i - k) * tickspan
                         end