diff --git a/routes/_actions/addInstance.js b/routes/_actions/addInstance.js
index fd5a1ee1..9fabce8f 100644
--- a/routes/_actions/addInstance.js
+++ b/routes/_actions/addInstance.js
@@ -13,7 +13,7 @@ const REDIRECT_URI = (typeof location !== 'undefined'
 async function redirectToOauth () {
   let instanceName = store.get('instanceNameInSearch')
   let loggedInInstances = store.get('loggedInInstances')
-  instanceName = instanceName.replace(/^https?:\/\//, '').replace('/$', '').toLowerCase()
+  instanceName = instanceName.replace(/^https?:\/\//, '').replace(/\/$/, '').replace('/$', '').toLowerCase()
   if (Object.keys(loggedInInstances).includes(instanceName)) {
     store.set({logInToInstanceError: `You've already logged in to ${instanceName}`})
     return