diff --git a/src/Umbraco.Web.UI.Client/src/less/rte.less b/src/Umbraco.Web.UI.Client/src/less/rte.less
index 6dfccdd0a3..60065ee1d2 100644
--- a/src/Umbraco.Web.UI.Client/src/less/rte.less
+++ b/src/Umbraco.Web.UI.Client/src/less/rte.less
@@ -63,8 +63,9 @@
 }
 
 /* Special case to support helviticons for the tiny mce button controls */
-.umb-rte .mce-ico.mce-i-custom[class^="icon-"],
-.umb-rte .mce-ico.mce-i-custom[class*=" icon-"] {
+// Also used in Prevalue editor.
+.mce-ico.mce-i-custom[class^="icon-"],
+.mce-ico.mce-i-custom[class*=" icon-"] {
     font-family: icomoon;
     font-size: 16px !important;
 }