1 files changed, 1 insertions, 1 deletions
diff --git a/lib/axlsx/workbook/worksheet/pivot_table_cache_definition.rb b/lib/axlsx/workbook/worksheet/pivot_table_cache_definition.rb
index 4928d5ac..3a6053e9 100644
--- a/lib/axlsx/workbook/worksheet/pivot_table_cache_definition.rb
+++ b/lib/axlsx/workbook/worksheet/pivot_table_cache_definition.rb
@@ -26,7 +26,7 @@ module Axlsx
     # The part name for this table
     # @return [String]
     def pn
-      "#{PIVOT_TABLE_CACHE_DEFINITION_PN % (index + 1)}"
+      format(PIVOT_TABLE_CACHE_DEFINITION_PN, index + 1)
     end
 
     # The identifier for this cache