diff --git a/font-src/support/parameters.js b/font-src/support/parameters.js
index 200203204..5c634b56a 100644
--- a/font-src/support/parameters.js
+++ b/font-src/support/parameters.js
@@ -126,6 +126,8 @@ const metricOverrideHandlers = {
 	leading: numericFieldHandler,
 	winMetricAscenderPad: numericFieldHandler,
 	winMetricDescenderPad: numericFieldHandler,
+	SymbolMid: numericFieldHandler,
+	parenSize: numericFieldHandler,
 	powerlineScaleY: numericFieldHandler,
 	powerlineScaleX: numericFieldHandler,
 	powerlineShiftY: numericFieldHandler,