diff --git a/mastodon/src/main/java/org/joinmastodon/android/api/PushSubscriptionManager.java b/mastodon/src/main/java/org/joinmastodon/android/api/PushSubscriptionManager.java
index da48c21be..84dd040d2 100644
--- a/mastodon/src/main/java/org/joinmastodon/android/api/PushSubscriptionManager.java
+++ b/mastodon/src/main/java/org/joinmastodon/android/api/PushSubscriptionManager.java
@@ -162,6 +162,8 @@ public class PushSubscriptionManager{
 						@Override
 						public void onSuccess(PushSubscription result){
 							MastodonAPIController.runInBackground(()->{
+								result.serverKey=result.serverKey.replace('/','_');
+								result.serverKey=result.serverKey.replace('+','-');
 								serverKey=deserializeRawPublicKey(Base64.decode(result.serverKey, Base64.URL_SAFE));
 
 								AccountSession session=AccountSessionManager.getInstance().tryGetAccount(accountID);