diff --git a/src/app/molecules/space-add-existing/SpaceAddExisting.jsx b/src/app/molecules/space-add-existing/SpaceAddExisting.jsx
index f7a3120..a9de7bd 100644
--- a/src/app/molecules/space-add-existing/SpaceAddExisting.jsx
+++ b/src/app/molecules/space-add-existing/SpaceAddExisting.jsx
@@ -88,7 +88,7 @@ function SpaceAddExistingContent({ roomId }) {
   };
 
   const handleSearch = (ev) => {
-    const term = ev.target.value.toLocaleLowerCase().replaceAll(' ', '');
+    const term = ev.target.value.toLocaleLowerCase().replace(/\s/g, '');
     if (term === '') {
       setSearchIds(null);
       return;
@@ -100,7 +100,7 @@ function SpaceAddExistingContent({ roomId }) {
         if (!name) return false;
         name = name.normalize('NFKC')
           .toLocaleLowerCase()
-          .replaceAll(' ', '');
+          .replace(/\s/g, '');
         return name.includes(term);
       });
       setSearchIds(searchedIds);
diff --git a/src/client/state/RoomsInput.js b/src/client/state/RoomsInput.js
index 3bb3688..1e2fa19 100644
--- a/src/client/state/RoomsInput.js
+++ b/src/client/state/RoomsInput.js
@@ -97,13 +97,13 @@ function getFormattedBody(markdown) {
 function getReplyFormattedBody(roomId, reply) {
   const replyToLink = `<a href="https://matrix.to/#/${roomId}/${reply.eventId}">In reply to</a>`;
   const userLink = `<a href="https://matrix.to/#/${reply.userId}">${reply.userId}</a>`;
-  const formattedReply = getFormattedBody(reply.body.replaceAll('\n', '\n> '));
+  const formattedReply = getFormattedBody(reply.body.replace(/\n/g, '\n> '));
   return `<mx-reply><blockquote>${replyToLink}${userLink}<br />${formattedReply}</blockquote></mx-reply>`;
 }
 
 function bindReplyToContent(roomId, reply, content) {
   const newContent = { ...content };
-  newContent.body = `> <${reply.userId}> ${reply.body.replaceAll('\n', '\n> ')}`;
+  newContent.body = `> <${reply.userId}> ${reply.body.replace(/\n/g, '\n> ')}`;
   newContent.body += `\n\n${content.body}`;
   newContent.format = 'org.matrix.custom.html';
   newContent['m.relates_to'] = content['m.relates_to'] || {};
diff --git a/src/util/AsyncSearch.js b/src/util/AsyncSearch.js
index eb39f29..d0a2130 100644
--- a/src/util/AsyncSearch.js
+++ b/src/util/AsyncSearch.js
@@ -123,7 +123,7 @@ class AsyncSearch extends EventEmitter {
   _normalize(item) {
     let myItem = item.normalize(this.normalizeUnicode ? 'NFKC' : 'NFC');
     if (!this.isCaseSensitive) myItem = myItem.toLocaleLowerCase();
-    if (this.ignoreWhitespace) myItem = myItem.replaceAll(' ', '');
+    if (this.ignoreWhitespace) myItem = myItem.replace(/\s/g, '');
     return myItem;
   }