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-rw-r--r--lib/axlsx/workbook/worksheet/data_validation.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/axlsx/workbook/worksheet/data_validation.rb b/lib/axlsx/workbook/worksheet/data_validation.rb
index c2c1cb0e..2591c669 100644
--- a/lib/axlsx/workbook/worksheet/data_validation.rb
+++ b/lib/axlsx/workbook/worksheet/data_validation.rb
@@ -233,7 +233,7 @@ module Axlsx
elsif @type == :list
attributes << [:showDropDown, :formula1]
elsif @type == :custom
- attributes << :formula1
+ attributes << [:formula1]
else
attributes = []
end