diff --git a/app/src/main/java/eu/faircode/email/EmailService.java b/app/src/main/java/eu/faircode/email/EmailService.java
index 1eb85df612..4905bfc0e6 100644
--- a/app/src/main/java/eu/faircode/email/EmailService.java
+++ b/app/src/main/java/eu/faircode/email/EmailService.java
@@ -280,7 +280,7 @@ public class EmailService implements AutoCloseable {
             properties.put("mail." + protocol + ".appendbuffersize", Integer.toString(APPEND_BUFFER_SIZE));
 
             if (!"gimaps".equals(protocol) && BuildConfig.DEBUG)
-                properties.put("mail." + protocol + ".folder.class", IMAPFolderEX.class.getName());
+                properties.put("mail." + protocol + ".folder.class", IMAPFolderEx.class.getName());
 
         } else if ("smtp".equals(protocol) || "smtps".equals(protocol)) {
             // https://javaee.github.io/javamail/docs/api/com/sun/mail/smtp/package-summary.html#properties
diff --git a/app/src/main/java/eu/faircode/email/IMAPFolderEX.java b/app/src/main/java/eu/faircode/email/IMAPFolderEx.java
similarity index 97%
rename from app/src/main/java/eu/faircode/email/IMAPFolderEX.java
rename to app/src/main/java/eu/faircode/email/IMAPFolderEx.java
index 0af6503af7..8015d07af6 100644
--- a/app/src/main/java/eu/faircode/email/IMAPFolderEX.java
+++ b/app/src/main/java/eu/faircode/email/IMAPFolderEx.java
@@ -43,12 +43,12 @@ import javax.mail.MessageRemovedException;
 import javax.mail.MessagingException;
 import javax.mail.UIDFolder;
 
-public class IMAPFolderEX extends IMAPFolder {
-    public IMAPFolderEX(String fullName, char separator, IMAPStore store, Boolean isNamespace) {
+public class IMAPFolderEx extends IMAPFolder {
+    public IMAPFolderEx(String fullName, char separator, IMAPStore store, Boolean isNamespace) {
         super(fullName, separator, store, isNamespace);
     }
 
-    public IMAPFolderEX(ListInfo li, IMAPStore store) {
+    public IMAPFolderEx(ListInfo li, IMAPStore store) {
         super(li, store);
     }