diff --git a/icalendar.ts b/icalendar.ts
index e66d838..ee5f375 100644
--- a/icalendar.ts
+++ b/icalendar.ts
@@ -158,10 +158,13 @@ async function getSources(): Promise<Source[]> {
 async function fetchAndParseCalendar(source: Source): Promise<CalendarEvent[]> {
   let url = source.url.trim();
   
-  // Handle internal spaces which are common in copy-pasted URLs
-  if (url.includes(" ")) {
-    console.log(`[iCalendar] URL contains spaces, encoding: "${url}"`);
-    url = encodeURI(url);
+  // Handle any whitespace (space, tabs, non-breaking spaces, etc.)
+  const whitespaceRegex = /\s/g;
+  if (whitespaceRegex.test(url)) {
+    const matches = url.match(whitespaceRegex);
+    const charCodes = matches?.map(m => m.charCodeAt(0)).join(", ");
+    console.log(`[iCalendar] URL contains whitespace (charCodes: ${charCodes}), encoding: "${url}"`);
+    url = url.replace(/\s/g, (match) => encodeURIComponent(match));
   }
 
   console.log(`[iCalendar] Fetching: ${url}`);