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-rw-r--r--lib/axlsx/stylesheet/styles.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/axlsx/stylesheet/styles.rb b/lib/axlsx/stylesheet/styles.rb
index c3dd8d06..2bad15e8 100644
--- a/lib/axlsx/stylesheet/styles.rb
+++ b/lib/axlsx/stylesheet/styles.rb
@@ -470,7 +470,7 @@ module Axlsx
# When the type is :dxf we always need to create a new numFmt object
if options[:format_code] || options[:type] == :dxf
# If this is a standard xf we pull from numFmts the highest current and increment for num_fmt
- options[:num_fmt] ||= (@numFmts.map { |num_fmt| num_fmt.numFmtId }.max + 1) if options[:type] != :dxf
+ options[:num_fmt] ||= (@numFmts.map(&:numFmtId).max + 1) if options[:type] != :dxf
numFmt = NumFmt.new(:numFmtId => options[:num_fmt] || 0, :formatCode => options[:format_code].to_s)
options[:type] == :dxf ? numFmt : (numFmts << numFmt; numFmt.numFmtId)
else