diff --git a/lib/prawn/svg/elements.rb b/lib/prawn/svg/elements.rb
index 123c14e..33313ad 100644
--- a/lib/prawn/svg/elements.rb
+++ b/lib/prawn/svg/elements.rb
@@ -2,6 +2,8 @@ module Prawn::SVG::Elements
   COMMA_WSP_REGEXP = /(?:\s+,?\s*|,\s*)/
 end
 
+require 'prawn/svg/elements/call_duplicator'
+
 %w(base depth_first_base root container viewport style text text_component line polyline polygon circle ellipse rect path use image gradient marker ignored).each do |filename|
   require "prawn/svg/elements/#{filename}"
 end
diff --git a/lib/prawn/svg/elements/base.rb b/lib/prawn/svg/elements/base.rb
index 3e6f77e..7a189e3 100644
--- a/lib/prawn/svg/elements/base.rb
+++ b/lib/prawn/svg/elements/base.rb
@@ -1,6 +1,8 @@
 class Prawn::SVG::Elements::Base
   extend Forwardable
 
+  include Prawn::SVG::Elements::CallDuplicator
+
   include Prawn::SVG::Calculators::Pixels
 
   include Prawn::SVG::Attributes::Transform
@@ -106,7 +108,7 @@ def append_calls_to_parent
   end
 
   def add_calls_from_element(other)
-    @calls.concat other.base_calls
+    @calls.concat duplicate_calls(other.base_calls)
   end
 
   def new_call_context_from_base
diff --git a/lib/prawn/svg/elements/call_duplicator.rb b/lib/prawn/svg/elements/call_duplicator.rb
new file mode 100644
index 0000000..9e0926a
--- /dev/null
+++ b/lib/prawn/svg/elements/call_duplicator.rb
@@ -0,0 +1,37 @@
+#
+# Unfortunately, prawn mutates arguments passed in to it.
+# When we make a copy of one of the call stacks, we need to make a deep
+# duplicate of it so that the first time prawn mutates the arguments, it
+# won't affect the subsequent calls.
+#
+module Prawn::SVG::Elements::CallDuplicator
+  private
+
+  def duplicate_calls(calls)
+    calls.map { |call| duplicate_call(call) }
+  end
+
+  def duplicate_call(call)
+    [call[0], duplicate_array(call[1]), duplicate_calls(call[2])]
+  end
+
+  def duplicate_array(array)
+    array.map do |value|
+      case value
+      when Array then duplicate_array(value)
+      when Hash  then duplicate_hash(value)
+      else            value
+      end
+    end
+  end
+
+  def duplicate_hash(hash)
+    hash.each.with_object({}) do |(key, value), result|
+      result[key] = case value
+                    when Array then duplicate_array(value)
+                    when Hash  then duplicate_hash(value)
+                    else            value
+                    end
+    end
+  end
+end