diff --git a/lib/svggvs/file.rb b/lib/svggvs/file.rb
index c724274..e7f8f19 100644
--- a/lib/svggvs/file.rb
+++ b/lib/svggvs/file.rb
@@ -29,12 +29,28 @@ module SVGGVS
       @target ||= doc.at_css('g[inkscape|label="Target"]')
     end
 
+    def defs
+      @defs ||= doc.at_css('defs')
+    end
+
+    def original_defs
+      @original_defs ||= defs.dup
+    end
+
+    def reset_defs!
+      defs.children.each(&:remove)
+
+      defs << original_defs.children
+    end
+
     def doc
       return @doc if @doc
 
       @doc = Nokogiri::XML(::File.read(@path))
       clear_targets!
 
+      original_defs
+
       @doc
     end
 
@@ -49,6 +65,8 @@ module SVGGVS
 
       target_obj = Target.new(new_target)
 
+      reset_defs!
+
       yield target_obj
 
       target_obj.replaced
@@ -56,6 +74,10 @@ module SVGGVS
 
       target << target_obj.target
 
+      target_obj.injected_defs.values.each do |v|
+        defs << v
+      end
+
       @instance += 1
     end
 
diff --git a/lib/svggvs/target.rb b/lib/svggvs/target.rb
index 212bf35..cd83dcb 100644
--- a/lib/svggvs/target.rb
+++ b/lib/svggvs/target.rb
@@ -16,12 +16,18 @@ module SVGGVS
       @injected_sources ||= {}
     end
 
+    def injected_defs
+      @injected_defs ||= {}
+    end
+
     def inject!
       css("g[inkscape|groupmode='layer']").each do |layer|
         if filename = layer['inkscape:label'][/inject (.*\.svg)/, 1]
           injected_sources[filename] ||= begin
                                             data = Nokogiri::XML(::File.read(filename))
 
+                                            injected_defs[filename] = data.css("svg > defs")
+
                                             data.css("svg > g[inkscape|groupmode='layer']")
                                           end
 
diff --git a/lib/svggvs/version.rb b/lib/svggvs/version.rb
index 3103840..f22adc8 100644
--- a/lib/svggvs/version.rb
+++ b/lib/svggvs/version.rb
@@ -1,3 +1,3 @@
 module SVGGVS
-  VERSION = "0.0.9"
+  VERSION = "0.0.10"
 end