diff --git a/demo/moulinrouge/tests.py b/demo/moulinrouge/tests.py
index f2aea9b..c641c01 100644
--- a/demo/moulinrouge/tests.py
+++ b/demo/moulinrouge/tests.py
@@ -893,6 +893,69 @@ def get_test_routes(app):
         line.add('_', [1, 32, 12, .4, .009])
         return line.render_response()
 
+    @app.route('/test/custom_css_file')
+    def test_custom_css_file():
+        from tempfile import NamedTemporaryFile
+        custom_css = '''
+          {{ id }}text {
+            fill: green;
+            font-family: monospace;
+          }
+          {{ id }}.legends .legend text {
+            font-size: {{ font_sizes.legend }};
+          }
+          {{ id }}.axis {
+            stroke: #666;
+          }
+          {{ id }}.axis text {
+            font-size: {{ font_sizes.label }};
+            font-family: sans;
+            stroke: none;
+          }
+          {{ id }}.axis.y text {
+            text-anchor: end;
+          }
+          {{ id }}#tooltip text {
+            font-size: {{ font_sizes.tooltip }};
+          }
+          {{ id }}.dot {
+            fill: yellow;
+          }
+          {{ id }}.color-0 {
+            stroke: #ff1100;
+            fill: #ff1100;
+          }
+          {{ id }}.color-1 {
+            stroke: #ffee00;
+            fill: #ffee00;
+          }
+          {{ id }}.color-2 {
+            stroke: #66bb44;
+            fill: #66bb44;
+          }
+          {{ id }}.color-3 {
+            stroke: #88bbdd;
+            fill: #88bbdd;
+          }
+          {{ id }}.color-4 {
+            stroke: #0000ff;
+            fill: #0000ff;
+          }
+        '''
+        custom_css_file = '/tmp/pygal_custom_style.css'
+        with open(custom_css_file, 'w') as f:
+            f.write(custom_css)
+        config = Config(fill=True, interpolate='cubic')
+        config.css.append(custom_css_file)
+        chart = StackedLine(config)
+        chart.add('A', [1, 3,  5, 16, 13, 3,  7])
+        chart.add('B', [5, 2,  3,  2,  5, 7, 17])
+        chart.add('C', [6, 10, 9,  7,  3, 1,  0])
+        chart.add('D', [2,  3, 5,  9, 12, 9,  5])
+        chart.add('E', [7,  4, 2,  1,  2, 10, 0])
+        return chart.render_response()
+
+
     @app.route('/test/legendlink/<chart>')
     def test_legend_link_for(chart):
         chart = CHARTS_BY_NAME[chart]()
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 8dcc69f..d2450c4 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -2,6 +2,12 @@
 Changelog
 =========
 
+2.0.12
+======
+
+* Use custom xml_declaration avoiding conflict with processing instructions
+
+
 2.0.11
 ======
 
diff --git a/pygal/__init__.py b/pygal/__init__.py
index d567fc5..18320d0 100644
--- a/pygal/__init__.py
+++ b/pygal/__init__.py
@@ -24,7 +24,7 @@ and the maps extensions namespace module.
 
 """
 
-__version__ = '2.0.11'
+__version__ = '2.0.12'
 
 import pkg_resources
 import sys
diff --git a/pygal/svg.py b/pygal/svg.py
index 8608a79..c485545 100644
--- a/pygal/svg.py
+++ b/pygal/svg.py
@@ -321,25 +321,24 @@ class Svg(object):
         args = {
             'encoding': 'utf-8'
         }
+
         svg = b''
         if etree.lxml:
             args['pretty_print'] = pretty_print
-            args['xml_declaration'] = not self.graph.disable_xml_declaration
-        else:
-            if not self.graph.disable_xml_declaration:
-                svg = b"<?xml version='1.0' encoding='utf-8'?>\n"
-        svg += etree.tostring(
-            self.root, **args)
 
-        if 'xml_declaration' in args:
-            args.pop('xml_declaration')
+        if not self.graph.disable_xml_declaration:
+            svg = b"<?xml version='1.0' encoding='utf-8'?>\n"
 
         if not self.graph.disable_xml_declaration:
-            svg = b'\n'.join(
+            svg += b'\n'.join(
                 [etree.tostring(
                     pi, **args)
-                 for pi in self.processing_instructions] + [svg]
+                 for pi in self.processing_instructions]
             )
+
+        svg += etree.tostring(
+            self.root, **args)
+
         if self.graph.disable_xml_declaration or is_unicode:
             svg = svg.decode('utf-8')
         return svg