diff --git a/sphinx/ext/graphviz.py b/sphinx/ext/graphviz.py
index b54cb3c09..6b875081f 100644
--- a/sphinx/ext/graphviz.py
+++ b/sphinx/ext/graphviz.py
@@ -214,7 +214,7 @@ def get_svg_tag(svgref, svgfile, imgcls=None):
     # The object tag works fine on Firefox and WebKit
     # Besides it's a hack, this strategy does not mess with templates.
     imgcss = imgcls and ' class="%s"' % imgcls or ''
-    return '<object type="image/svg+xml" data="%s"%s%s/>\n' % \
+    return '<object type="image/svg+xml" data="%s"%s%s></object>\n' % \
            (svgref, imgcss, style)