diff --git a/src/backends/plotly.jl b/src/backends/plotly.jl
index 5dc7ccff..3b72a836 100644
--- a/src/backends/plotly.jl
+++ b/src/backends/plotly.jl
@@ -437,7 +437,7 @@ end
 plotly_colorscale(c, α) = plotly_colorscale(cgrad(alpha=α), α)
 function plotly_colorscale(c::AbstractVector{<:RGBA}, α)
     if length(c) == 1
-        return [[0.0, rgba_string(plot_color(c[1], α))]]
+        return [[0.0, rgba_string(plot_color(c[1], α))], [1.0, rgba_string(plot_color(c[1], α))]]
     else
         vals = linspace(0.0, 1.0, length(c))
         return [[vals[i], rgba_string(plot_color(c[i], α))] for i in eachindex(c)]