diff --git a/lib/channel/opts.js b/lib/channel/opts.js
index f3a0dc49..84950c83 100644
--- a/lib/channel/opts.js
+++ b/lib/channel/opts.js
@@ -145,9 +145,14 @@ OptionsModule.prototype.handleSetOptions = function (user, data) {
 
     if ("externalcss" in data && user.account.effectiveRank >= 3) {
         var link = (""+data.externalcss).substring(0, 255);
+        if (!link) {
+            this.opts.externalcss = "";
+            return;
+        }
+
         try {
             var data = url.parse(link);
-            if (!data.protocol || !data.protocol.match(/^(https?|ftp):$/)) {
+            if (!data.protocol || !data.protocol.match(/^(https?|ftp):/)) {
                 throw "Unacceptable protocol " + data.protocol;
             } else if (!data.host) {
                 throw "URL is missing host";
@@ -167,10 +172,14 @@ OptionsModule.prototype.handleSetOptions = function (user, data) {
 
     if ("externaljs" in data && user.account.effectiveRank >= 3) {
         var link = (""+data.externaljs).substring(0, 255);
+        if (!link) {
+            this.opts.externaljs = "";
+            return;
+        }
 
         try {
             var data = url.parse(link);
-            if (!data.protocol || !data.protocol.match(/^(https?|ftp)$/)) {
+            if (!data.protocol || !data.protocol.match(/^(https?|ftp):/)) {
                 throw "Unacceptable protocol " + data.protocol;
             } else if (!data.host) {
                 throw "URL is missing host";