diff --git a/mozilla/gfx/src/gtk/nsFontMetricsGTK.cpp b/mozilla/gfx/src/gtk/nsFontMetricsGTK.cpp
index b35de99e833..8064453a4db 100644
--- a/mozilla/gfx/src/gtk/nsFontMetricsGTK.cpp
+++ b/mozilla/gfx/src/gtk/nsFontMetricsGTK.cpp
@@ -394,6 +394,10 @@ static nsFontCharSetMap gCharSetMap[] =
   { "sunolcursor-1",      &Unknown       },
   { "sunolglyph-1",       &Unknown       },
   { "tis620.2529-1",      &TIS620        },
+  { "tis620.2533-0",      &TIS620        },
+  { "tis620.2533-1",      &TIS620        },
+  { "tis620-0",           &TIS620        },
+  { "iso8859-11",         &TIS620        },
   { "ucs2.cjk-0",         &Unknown       },
   { "ucs2.cjk_japan-0",   &Unknown       },
   { "ucs2.cjk_taiwan-0",  &Unknown       },