3 files changed, 10 insertions, 9 deletions
diff --git a/lib/axlsx.rb b/lib/axlsx.rb
index 8cecf47a..ffebc7ac 100644
--- a/lib/axlsx.rb
+++ b/lib/axlsx.rb
@@ -127,6 +127,14 @@ module Axlsx
     s.gsub(/_(.)/){ $1.upcase }
   end
 
+    # returns the provided string with all invalid control charaters
+    # removed.
+    # @param [String] str The sting to process
+    # @return [String]
+    def self.sanitize(str)
+      str.gsub(CONTROL_CHAR_REGEX, '')
+    end
+
 
   # Instructs the serializer to not try to escape cell value input. 
   # This will give you a huge speed bonus, but if you content has <, > or other xml character data
diff --git a/lib/axlsx/workbook/shared_strings_table.rb b/lib/axlsx/workbook/shared_strings_table.rb
index 7c08205e..ed6643f2 100644
--- a/lib/axlsx/workbook/shared_strings_table.rb
+++ b/lib/axlsx/workbook/shared_strings_table.rb
@@ -50,6 +50,7 @@ module Axlsx
       str << '<?xml version="1.0" encoding="UTF-8"?><sst xmlns="' << XML_NS << '"'
       str << ' count="' << @count.to_s << '" uniqueCount="' << unique_count.to_s << '"'
       str << ' xml:space="' << xml_space.to_s << '">' << @shared_xml_string << '</sst>'
+      str = Axlsx::sanitize(str)
     end
 
     private
diff --git a/lib/axlsx/workbook/worksheet/worksheet.rb b/lib/axlsx/workbook/worksheet/worksheet.rb
index ecba9254..df755abf 100644
--- a/lib/axlsx/workbook/worksheet/worksheet.rb
+++ b/lib/axlsx/workbook/worksheet/worksheet.rb
@@ -552,15 +552,7 @@ module Axlsx
         item.to_xml_string(str) if item
       end
       str << '</worksheet>'
-      sanitize(str)
-    end
-
-    # returns the provided string with all invalid control charaters
-    # removed.
-    # @param [String] str The sting to process
-    # @return [String]
-    def sanitize(str)
-      str.gsub(CONTROL_CHAR_REGEX, '')
+      Axlsx::sanitize(str)
     end
 
     # The worksheet relationships. This is managed automatically by the worksheet