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-rw-r--r--lib/axlsx/drawing/scatter_series.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/axlsx/drawing/scatter_series.rb b/lib/axlsx/drawing/scatter_series.rb
index 865c6f85..ffff81f5 100644
--- a/lib/axlsx/drawing/scatter_series.rb
+++ b/lib/axlsx/drawing/scatter_series.rb
@@ -121,7 +121,7 @@ module Axlsx
if !@show_marker
'<c:symbol val="none"/>'
elsif @marker_symbol != :default
- '<c:symbol val="' << @marker_symbol.to_s << '"/>'
+ +'<c:symbol val="' << @marker_symbol.to_s << '"/>'
end.to_s
end
end