diff --git a/src/mathed/InsetMathMacro.cpp b/src/mathed/InsetMathMacro.cpp
index b5b0322a54..6e8ea5c30b 100644
--- a/src/mathed/InsetMathMacro.cpp
+++ b/src/mathed/InsetMathMacro.cpp
@@ -669,8 +669,9 @@ void InsetMathMacro::updateRepresentation(Cursor * cur, MacroContext const & mc,
 	// than the one protected by UpdateLocker.
 	docstring const & display = d->macro_->display();
 	docstring const latexname = from_ascii("\\") + macroName();
-	if (d->macro_->expand(values, d->expanded_)
-	    && !support::contains(display, latexname)) {
+	bool const ret = d->macro_->expand(values, d->expanded_);
+	d->expanded_.setBuffer(buffer());
+	if (ret && !support::contains(display, latexname)) {
 		if (utype == OutputUpdate && !d->expanded_.empty())
 			d->expanded_.updateMacros(cur, mc, utype, nesting);
 	}