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-rw-r--r--lib/axlsx/drawing/str_val.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/axlsx/drawing/str_val.rb b/lib/axlsx/drawing/str_val.rb
index 86663cec..8bae630d 100644
--- a/lib/axlsx/drawing/str_val.rb
+++ b/lib/axlsx/drawing/str_val.rb
@@ -24,7 +24,7 @@ module Axlsx
# serialize the object
def to_xml_string(idx, str = +'')
- Axlsx::validate_unsigned_int(idx)
+ Axlsx.validate_unsigned_int(idx)
unless v.to_s.empty?
str << '<c:pt idx="' << idx.to_s << '"><c:v>' << ::CGI.escapeHTML(v.to_s) << '</c:v></c:pt>'
end