diff --git a/src/mathed/InsetMathClass.cpp b/src/mathed/InsetMathClass.cpp
index 0c22d478c7..2bfea82ce0 100644
--- a/src/mathed/InsetMathClass.cpp
+++ b/src/mathed/InsetMathClass.cpp
@@ -11,6 +11,7 @@
 #include <config.h>
 
 #include "InsetMathClass.h"
+#include "MathStream.h"
 
 #include "support/docstream.h"
 
@@ -56,6 +57,16 @@ void InsetMathClass::write(TeXMathStream & os) const
 }
 
 
+void InsetMathClass::mathmlize(MathMLStream & ms) const
+{
+	// Skip the \mathXXX macro, the MathML processor is supposed to handle
+	// spacing down the line.
+	for (size_t i = 0; i < nargs(); ++i) {
+		ms << cell(i);
+	}
+}
+
+
 docstring InsetMathClass::name() const
 {
 	return class_to_string(math_class_);
diff --git a/src/mathed/InsetMathClass.h b/src/mathed/InsetMathClass.h
index 89189f2b0d..f4308beb9b 100644
--- a/src/mathed/InsetMathClass.h
+++ b/src/mathed/InsetMathClass.h
@@ -43,6 +43,8 @@ public:
 	///
 	void write(TeXMathStream & os) const override;
 	///
+	void mathmlize(MathMLStream & ms) const override;
+	///
 	void infoize(odocstream & os) const override;
 	///
 	InsetCode lyxCode() const override { return MATH_CLASS_CODE; }
diff --git a/src/mathed/MathClass.h b/src/mathed/MathClass.h
index 169bfdb51a..af4f884cca 100644
--- a/src/mathed/MathClass.h
+++ b/src/mathed/MathClass.h
@@ -40,7 +40,7 @@ class MetricsBase;
  * + Vcent: a vbox to be centered, produced by \vcenter.
  *
  * Over, Under, Acc, Rad and Vcent are not considered in the enum
- * below. The relvant elements will be considered as Ord.
+ * below. The relevant elements will be considered as Ord.
  */
 enum MathClass {
 	MC_ORD,