Index: lyx-1.6.3/src/frontends/qt4/LengthCombo.cpp
===================================================================
--- lyx-1.6.3.orig/src/frontends/qt4/LengthCombo.cpp
+++ lyx-1.6.3/src/frontends/qt4/LengthCombo.cpp
@@ -27,7 +27,7 @@ LengthCombo::LengthCombo(QWidget * paren
 	for (int i = 0; i < lyx::num_units; i++) {
 		// mu does not make sense usually
 		// so it must be added manually, if needed
-		if (lyx::unit_name[i] == "mu")
+		if (!strcmp(lyx::unit_name[i], "mu"))
 			continue;
 		QComboBox::addItem(lyx::qt_(lyx::unit_name_gui[i]),
 			lyx::toqstr(lyx::unit_name[i]));