diff --git a/unpacked/jax/input/MathML/jax.js b/unpacked/jax/input/MathML/jax.js
index c8c508a76..eec45be2b 100644
--- a/unpacked/jax/input/MathML/jax.js
+++ b/unpacked/jax/input/MathML/jax.js
@@ -77,7 +77,9 @@
         mml = this.TeXAtom(match[2]);
       } else if (!(MML[type] && MML[type].isa && MML[type].isa(MML.mbase))) {
         MathJax.Hub.signal.Post(["MathML Jax - unknown node type",type]);
-        return MML.merror(_("UnknownNodeType","Unknown node type: %1",type));
+        var err = MML.merror(_("UnknownNodeType","Unknown node type: %1",type));
+        if (MathJax.Localization.fontDirection()) {err = MML.mstyle(err).With({dir: "rtl"})};
+        return err;
       } else {
         mml = MML[type]();
       }
diff --git a/unpacked/jax/output/HTML-CSS/autoload/mglyph.js b/unpacked/jax/output/HTML-CSS/autoload/mglyph.js
index 97e14835e..5e736d364 100644
--- a/unpacked/jax/output/HTML-CSS/autoload/mglyph.js
+++ b/unpacked/jax/output/HTML-CSS/autoload/mglyph.js
@@ -46,6 +46,7 @@ MathJax.Hub.Register.StartupHook("HTML-CSS Jax Ready",function () {
               if (values.alt === "")
                 {values.alt = LOCALE._(["MathML","BadMglyphFont"],"Bad font: %1",font.family)}
               err = MML.merror(values.alt).With({mathsize:"75%"});
+              if (LOCALE.fontDirection()) {err = MML.mstyle(err).With({dir: "rtl"})};
               this.Append(err); err.toHTML(span); this.data.pop();
               span.bbox = err.HTMLspanElement().bbox;
             }
@@ -65,6 +66,7 @@ MathJax.Hub.Register.StartupHook("HTML-CSS Jax Ready",function () {
           err = MML.merror(
             LOCALE._(["MathML","BadMglyph"],"Bad mglyph: %1",values.src)
           ).With({mathsize:"75%"});
+          if (LOCALE.fontDirection()) {err = MML.mstyle(err).With({dir: "rtl"})};
           this.Append(err); err.toHTML(span); this.data.pop();
           span.bbox = err.HTMLspanElement().bbox;
         } else {