diff --git a/js/units.js b/js/units.js
index 80d72fa0..7a26ddda 100644
--- a/js/units.js
+++ b/js/units.js
@@ -38,6 +38,7 @@ define( require => {
       'N', // Newtons
       'radians', // radians, note this has the same abbreviation as the radiation term "rad" so we use the full term
       'L/s',
+      'L',
 
       // NOTE: In time, these will be replaced with abbreviations, see above.
       'amperes',