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-rw-r--r--lib/axlsx/drawing/line_series.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/axlsx/drawing/line_series.rb b/lib/axlsx/drawing/line_series.rb
index fbed4000..4854a718 100644
--- a/lib/axlsx/drawing/line_series.rb
+++ b/lib/axlsx/drawing/line_series.rb
@@ -89,7 +89,7 @@ module Axlsx
if !@show_marker
str << '<c:marker><c:symbol val="none"/></c:marker>'
elsif @marker_symbol != :default
- str << '<c:marker><c:symbol val="' + @marker_symbol.to_s + '"/></c:marker>'
+ str << '<c:marker><c:symbol val="' << @marker_symbol.to_s << '"/></c:marker>'
end
@labels.to_xml_string(str) unless @labels.nil?