diff --git a/app/src/main/java/com/todoroo/astrid/service/TaskDeleter.java b/app/src/main/java/com/todoroo/astrid/service/TaskDeleter.java
index c234f6370..ca9ccb8b0 100644
--- a/app/src/main/java/com/todoroo/astrid/service/TaskDeleter.java
+++ b/app/src/main/java/com/todoroo/astrid/service/TaskDeleter.java
@@ -5,6 +5,7 @@ import static com.todoroo.astrid.dao.TaskDao.TaskCriteria.includeHidden;
 import static com.todoroo.astrid.dao.TaskDao.TaskCriteria.isVisible;
 import static com.todoroo.astrid.dao.TaskDao.TaskCriteria.notCompleted;
 import static org.tasks.db.DbUtils.batch;
+import static org.tasks.db.DbUtils.collect;
 
 import com.google.common.collect.ImmutableList;
 import com.todoroo.astrid.api.Filter;
@@ -68,13 +69,13 @@ public class TaskDeleter {
 
   public List<Task> markDeleted(List<Long> taskIds) {
     Set<Long> ids = new HashSet<>(taskIds);
-    batch(taskIds, i -> ids.addAll(googleTaskDao.getChildren(i)));
-    batch(taskIds, i -> ids.addAll(caldavDao.getChildren(i)));
+    ids.addAll(collect(taskIds, googleTaskDao::getChildren));
+    ids.addAll(collect(taskIds, caldavDao::getChildren));
     deletionDao.markDeleted(ids);
-    workManager.cleanup(taskIds);
+    workManager.cleanup(ids);
     workManager.sync(false);
     localBroadcastManager.broadcastRefresh();
-    return taskDao.fetch(taskIds);
+    return collect(ids, taskDao::fetch);
   }
 
   public void delete(Task task) {
diff --git a/app/src/main/java/org/tasks/db/DbUtils.java b/app/src/main/java/org/tasks/db/DbUtils.java
index e4f05f017..26df62ab0 100644
--- a/app/src/main/java/org/tasks/db/DbUtils.java
+++ b/app/src/main/java/org/tasks/db/DbUtils.java
@@ -1,10 +1,12 @@
 package org.tasks.db;
 
+import static com.google.common.collect.Lists.newArrayList;
 import static com.google.common.collect.Lists.partition;
 
 import com.google.common.base.Function;
 import com.google.common.collect.Iterables;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.List;
 import org.tasks.Callback;
 
@@ -12,9 +14,9 @@ public class DbUtils {
 
   private static final int MAX_SQLITE_ARGS = 990;
 
-  public static <F, T> List<T> collect(List<F> items, Function<List<F>, List<T>> func) {
+  public static <F, T> List<T> collect(Collection<F> items, Function<List<F>, List<T>> func) {
     if (items.size() < MAX_SQLITE_ARGS) {
-      return func.apply(items);
+      return func.apply(items instanceof List ? (List<F>) items : newArrayList(items));
     }
     List<T> result = new ArrayList<>();
     batch(items, b -> result.addAll(func.apply(b)));
diff --git a/app/src/main/java/org/tasks/jobs/WorkManager.java b/app/src/main/java/org/tasks/jobs/WorkManager.java
index 601f2833f..113dd2c9b 100644
--- a/app/src/main/java/org/tasks/jobs/WorkManager.java
+++ b/app/src/main/java/org/tasks/jobs/WorkManager.java
@@ -87,7 +87,7 @@ public class WorkManager {
             .build());
   }
 
-  public void cleanup(List<Long> ids) {
+  public void cleanup(Iterable<Long> ids) {
     batch(
         ids,
         MAX_CLEANUP_LENGTH,