diff --git a/app/src/main/java/eu/faircode/email/ApplicationEx.java b/app/src/main/java/eu/faircode/email/ApplicationEx.java
index 33102a437b..2bcf90031f 100644
--- a/app/src/main/java/eu/faircode/email/ApplicationEx.java
+++ b/app/src/main/java/eu/faircode/email/ApplicationEx.java
@@ -614,6 +614,10 @@ public class ApplicationEx extends Application
             boolean cards = prefs.getBoolean("cards", true);
             if (!cards)
                 editor.remove("view_padding");
+        } else if (version < 1888) {
+            int class_min_difference = prefs.getInt("class_min_difference", 50);
+            if (class_min_difference == 0)
+                editor.putBoolean("classification", false);
         }
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && !BuildConfig.DEBUG)