diff --git a/lib/html/pipeline/emoji_filter.rb b/lib/html/pipeline/emoji_filter.rb
index 51943da4..f29310cc 100644
--- a/lib/html/pipeline/emoji_filter.rb
+++ b/lib/html/pipeline/emoji_filter.rb
@@ -65,7 +65,7 @@ def asset_path(name)
         if context[:asset_path]
           context[:asset_path].gsub(":file_name", "#{::CGI.escape(name)}.png")
         else
-          "emoji/#{::CGI.escape(name)}.png"
+          File.join("emoji", "#{::CGI.escape(name)}.png")
         end
       end