diff --git a/htmlparser/src/nsExpatDriver.cpp b/htmlparser/src/nsExpatDriver.cpp
index c247db7c9e2a..69688b0c65ea 100644
--- a/htmlparser/src/nsExpatDriver.cpp
+++ b/htmlparser/src/nsExpatDriver.cpp
@@ -204,6 +204,7 @@ static const nsCatalogData kCatalogTable[] = {
  {"-//W3C//DTD XHTML 1.0 Frameset//EN",        "xhtml11.dtd", nsnull },
  {"-//W3C//DTD XHTML Basic 1.0//EN",           "xhtml11.dtd", nsnull },
  {"-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN", "mathml.dtd",  "resource:/res/mathml.css" },
+ {"-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN", "mathml.dtd", "resource:/res/mathml.css" },
  {"-//W3C//DTD SVG 20001102//EN",              "svg.dtd",     nsnull },
  {nsnull, nsnull, nsnull}
 };
diff --git a/parser/htmlparser/src/nsExpatDriver.cpp b/parser/htmlparser/src/nsExpatDriver.cpp
index c247db7c9e2a..69688b0c65ea 100644
--- a/parser/htmlparser/src/nsExpatDriver.cpp
+++ b/parser/htmlparser/src/nsExpatDriver.cpp
@@ -204,6 +204,7 @@ static const nsCatalogData kCatalogTable[] = {
  {"-//W3C//DTD XHTML 1.0 Frameset//EN",        "xhtml11.dtd", nsnull },
  {"-//W3C//DTD XHTML Basic 1.0//EN",           "xhtml11.dtd", nsnull },
  {"-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN", "mathml.dtd",  "resource:/res/mathml.css" },
+ {"-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN", "mathml.dtd", "resource:/res/mathml.css" },
  {"-//W3C//DTD SVG 20001102//EN",              "svg.dtd",     nsnull },
  {nsnull, nsnull, nsnull}
 };