5 files changed, 6 insertions, 6 deletions
diff --git a/lib/axlsx/stylesheet/dxf.rb b/lib/axlsx/stylesheet/dxf.rb
index 2c10443a..dc9c2e1c 100644
--- a/lib/axlsx/stylesheet/dxf.rb
+++ b/lib/axlsx/stylesheet/dxf.rb
@@ -69,7 +69,7 @@ module Axlsx
       # Dxf elements have no attributes. All of the instance variables
       # are child elements.
       CHILD_ELEMENTS.each do |element|
-        self.send(element).to_xml_string(str) if self.send(element)
+        send(element).to_xml_string(str) if send(element)
       end
       str << '</dxf>'
     end
diff --git a/lib/axlsx/stylesheet/gradient_stop.rb b/lib/axlsx/stylesheet/gradient_stop.rb
index b0d66683..d4df9b3b 100644
--- a/lib/axlsx/stylesheet/gradient_stop.rb
+++ b/lib/axlsx/stylesheet/gradient_stop.rb
@@ -31,7 +31,7 @@ module Axlsx
     # @return [String]
     def to_xml_string(str = +'')
       str << '<stop position="' << position.to_s << '">'
-      self.color.to_xml_string(str)
+      color.to_xml_string(str)
       str << '</stop>'
     end
   end
diff --git a/lib/axlsx/stylesheet/table_style.rb b/lib/axlsx/stylesheet/table_style.rb
index 4bfd7cf5..95d10ce0 100644
--- a/lib/axlsx/stylesheet/table_style.rb
+++ b/lib/axlsx/stylesheet/table_style.rb
@@ -44,7 +44,7 @@ module Axlsx
     # @return [String]
     def to_xml_string(str = +'')
       str << '<tableStyle '
-      serialized_attributes str, { count: self.size }
+      serialized_attributes str, { count: size }
       str << '>'
       each { |table_style_el| table_style_el.to_xml_string(str) }
       str << '</tableStyle>'
diff --git a/lib/axlsx/stylesheet/table_styles.rb b/lib/axlsx/stylesheet/table_styles.rb
index b5f50b90..fec2a0f6 100644
--- a/lib/axlsx/stylesheet/table_styles.rb
+++ b/lib/axlsx/stylesheet/table_styles.rb
@@ -35,7 +35,7 @@ module Axlsx
     # @return [String]
     def to_xml_string(str = +'')
       str << '<tableStyles '
-      serialized_attributes str, { count: self.size }
+      serialized_attributes str, { count: size }
       str << '>'
       each { |table_style| table_style.to_xml_string(str) }
       str << '</tableStyles>'
diff --git a/lib/axlsx/stylesheet/xf.rb b/lib/axlsx/stylesheet/xf.rb
index 6d4aab66..0ea97f20 100644
--- a/lib/axlsx/stylesheet/xf.rb
+++ b/lib/axlsx/stylesheet/xf.rb
@@ -138,8 +138,8 @@ module Axlsx
       str << '<xf '
       serialized_attributes str
       str << '>'
-      alignment.to_xml_string(str) if self.alignment
-      protection.to_xml_string(str) if self.protection
+      alignment.to_xml_string(str) if alignment
+      protection.to_xml_string(str) if protection
       str << '</xf>'
     end
   end