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-rw-r--r--lib/axlsx/drawing/chart.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/axlsx/drawing/chart.rb b/lib/axlsx/drawing/chart.rb
index 9f59dc6a..63a12641 100644
--- a/lib/axlsx/drawing/chart.rb
+++ b/lib/axlsx/drawing/chart.rb
@@ -124,7 +124,7 @@ module Axlsx
# The part name for this chart
# @return [String]
def pn
- "#{CHART_PN % (index + 1)}"
+ format(CHART_PN, index + 1)
end
# The title object for the chart.