diff --git a/src/backends.jl b/src/backends.jl
index a668b3c8..4aec7d9d 100644
--- a/src/backends.jl
+++ b/src/backends.jl
@@ -374,7 +374,6 @@ function _initialize_backend(pkg::PlotlyBackend)
     catch
         @info "For saving to png with the Plotly backend ORCA has to be installed."
     end
-    push!(_plot_defaults, :include_mathjax => "")
 end
 
 const _plotly_attr = merge_with_base_supported([
@@ -418,7 +417,6 @@ const _plotly_attr = merge_with_base_supported([
     :tick_direction,
     :camera,
     :contour_labels,
-    :include_mathjax,
   ])
 
 const _plotly_seriestype = [
diff --git a/src/backends/plotly.jl b/src/backends/plotly.jl
index 22ddae4e..0d39c424 100644
--- a/src/backends/plotly.jl
+++ b/src/backends/plotly.jl
@@ -814,9 +814,9 @@ function plotly_html_head(plt::Plot)
     plotly =
         use_local_dependencies[] ? local_file : "https://cdn.plot.ly/plotly-latest.min.js"
 
-    include_mathjax = get(plt.attr, :include_mathjax, "")
+    include_mathjax = get(plt[:extra_plot_kwargs], :include_mathjax, "")
     mathjax_file = include_mathjax != "cdn" ? ("file://" * include_mathjax) : "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.7/MathJax.js?config=TeX-MML-AM_CHTML"
-    mathjax_head = include_mathjax == "" ? "" : "<script async src=\"$mathjax_file\"></script>\n\t\t"
+    mathjax_head = include_mathjax == "" ? "" : "<script src=\"$mathjax_file\"></script>\n\t\t"
 
     if isijulia() && !ijulia_initialized[]
         # using requirejs seems to be key to load a js depency in IJulia!