diff --git a/src/output.jl b/src/output.jl
index 14f15c30..41cc9d0c 100644
--- a/src/output.jl
+++ b/src/output.jl
@@ -278,6 +278,7 @@ using Requires
             show(io, MIME("text/html"), plt)
         end
 
+        ENV["MPLBACKEND"] = "Agg"
         set_ijulia_output("text/html")
     end
 end