diff --git a/src/args.jl b/src/args.jl
index 88b1638c..69e9f6f7 100644
--- a/src/args.jl
+++ b/src/args.jl
@@ -1127,10 +1127,14 @@ function warn_on_unsupported_args(pkg::AbstractBackend, plotattributes)
     empty!(_to_warn)
     bend = backend_name(pkg)
     already_warned = get!(_already_warned, bend, Set{Symbol}())
+    extra_kwargs = Dict{Symbol,Any}()
     for k in keys(plotattributes)
         is_attr_supported(pkg, k) && continue
         k in _suppress_warnings && continue
-        if plotattributes[k] != default(k)
+        default_value = default(k)
+        if ismissing(default_value)
+            extra_kwargs[k] = pop!(plotattributes, k)
+        elseif plotattributes[k] != default(k)
             k in already_warned || push!(_to_warn, k)
         end
     end
@@ -1141,6 +1145,7 @@ function warn_on_unsupported_args(pkg::AbstractBackend, plotattributes)
             @warn("Keyword argument $k not supported with $pkg.  Choose from: $(supported_attrs(pkg))")
         end
     end
+    return extra_kwargs
 end
 
 # _markershape_supported(pkg::AbstractBackend, shape::Symbol) = shape in supported_markers(pkg)
diff --git a/src/pipeline.jl b/src/pipeline.jl
index 4865b257..a99561ee 100644
--- a/src/pipeline.jl
+++ b/src/pipeline.jl
@@ -341,8 +341,8 @@ function _expand_subplot_extrema(sp::Subplot, plotattributes::AKW, st::Symbol)
 end
 
 function _add_the_series(plt, sp, plotattributes)
-    warn_on_unsupported_args(plt.backend, plotattributes)
-    warn_on_unsupported(plt.backend, plotattributes)
+    plt.attr[:extra_kwargs] = warnOnUnsupported_args(plt.backend, plotattributes)
+    warnOnUnsupported(plt.backend, plotattributes)
     series = Series(plotattributes)
     push!(plt.series_list, series)
     push!(sp.series_list, series)