diff --git a/app/src/main/java/eu/faircode/email/WorkerCleanup.java b/app/src/main/java/eu/faircode/email/WorkerCleanup.java
index a7a11132c3..e9a09b7d1e 100644
--- a/app/src/main/java/eu/faircode/email/WorkerCleanup.java
+++ b/app/src/main/java/eu/faircode/email/WorkerCleanup.java
@@ -224,8 +224,13 @@ public class WorkerCleanup extends Worker {
 
             if (manual) {
                 // https://www.sqlite.org/lang_vacuum.html
-                Log.i("Running VACUUM");
-                db.getOpenHelper().getWritableDatabase().execSQL("VACUUM;");
+                long size = context.getDatabasePath(db.getOpenHelper().getDatabaseName()).length();
+                long space = Helper.getAvailableStorageSpace();
+                if (size * 2 < space) {
+                    Log.i("Running VACUUM");
+                    db.getOpenHelper().getWritableDatabase().execSQL("VACUUM;");
+                } else
+                    Log.w("Insufficient space for VACUUM");
             }
 
         } catch (Throwable ex) {