diff --git a/src/mathed/InsetMathNest.cpp b/src/mathed/InsetMathNest.cpp
index 21bfdfeea2..8e04e2a5d9 100644
--- a/src/mathed/InsetMathNest.cpp
+++ b/src/mathed/InsetMathNest.cpp
@@ -371,6 +371,7 @@ MathData InsetMathNest::glue() const
 
 void InsetMathNest::write(WriteStream & os) const
 {
+	MathEnsurer ensurer(os, currentMode() == MATH_MODE);
 	ModeSpecifier specifier(os, currentMode(), lockedMode());
 	docstring const latex_name = name();
 	os << '\\' << latex_name;