diff --git a/index-scheduler/src/lib.rs b/index-scheduler/src/lib.rs
index a8605ca3d..0706c73b6 100644
--- a/index-scheduler/src/lib.rs
+++ b/index-scheduler/src/lib.rs
@@ -169,21 +169,16 @@ impl IndexScheduler {
 
         if let Some(indexes) = task.indexes() {
             for index in indexes {
-                self.update_index(&mut wtxn, index, |mut bitmap| {
-                    bitmap.insert(task_id);
-                    bitmap
-                })?;
+                self.update_index(&mut wtxn, index, |bitmap| drop(bitmap.insert(task_id)))?;
             }
         }
 
-        self.update_status(&mut wtxn, Status::Enqueued, |mut bitmap| {
+        self.update_status(&mut wtxn, Status::Enqueued, |bitmap| {
             bitmap.insert(task_id);
-            bitmap
         })?;
 
-        self.update_kind(&mut wtxn, task.kind.as_kind(), |mut bitmap| {
-            bitmap.insert(task_id);
-            bitmap
+        self.update_kind(&mut wtxn, task.kind.as_kind(), |bitmap| {
+            (bitmap.insert(task_id));
         })?;
 
         // we persist the file in last to be sure everything before was applied successfuly
diff --git a/index-scheduler/src/utils.rs b/index-scheduler/src/utils.rs
index 0efcdba2d..99190e086 100644
--- a/index-scheduler/src/utils.rs
+++ b/index-scheduler/src/utils.rs
@@ -50,24 +50,20 @@ impl IndexScheduler {
             .ok_or(Error::CorruptedTaskQueue)?;
 
         if old_task.status != task.status {
-            self.update_status(wtxn, old_task.status, |mut bitmap| {
+            self.update_status(wtxn, old_task.status, |bitmap| {
                 bitmap.remove(task.uid);
-                bitmap
             })?;
-            self.update_status(wtxn, task.status, |mut bitmap| {
+            self.update_status(wtxn, task.status, |bitmap| {
                 bitmap.insert(task.uid);
-                bitmap
             })?;
         }
 
         if old_task.kind.as_kind() != task.kind.as_kind() {
-            self.update_kind(wtxn, old_task.kind.as_kind(), |mut bitmap| {
+            self.update_kind(wtxn, old_task.kind.as_kind(), |bitmap| {
                 bitmap.remove(task.uid);
-                bitmap
             })?;
-            self.update_kind(wtxn, task.kind.as_kind(), |mut bitmap| {
+            self.update_kind(wtxn, task.kind.as_kind(), |bitmap| {
                 bitmap.insert(task.uid);
-                bitmap
             })?;
         }
 
@@ -91,10 +87,10 @@ impl IndexScheduler {
         &self,
         wtxn: &mut RwTxn,
         index: &str,
-        f: impl Fn(RoaringBitmap) -> RoaringBitmap,
+        f: impl Fn(&mut RoaringBitmap),
     ) -> Result<()> {
-        let tasks = self.get_index(&wtxn, index)?;
-        let tasks = f(tasks);
+        let mut tasks = self.get_index(&wtxn, index)?;
+        f(&mut tasks);
         self.put_index(wtxn, index, &tasks)?;
 
         Ok(())
@@ -117,10 +113,10 @@ impl IndexScheduler {
         &self,
         wtxn: &mut RwTxn,
         status: Status,
-        f: impl Fn(RoaringBitmap) -> RoaringBitmap,
+        f: impl Fn(&mut RoaringBitmap),
     ) -> Result<()> {
-        let tasks = self.get_status(&wtxn, status)?;
-        let tasks = f(tasks);
+        let mut tasks = self.get_status(&wtxn, status)?;
+        f(&mut tasks);
         self.put_status(wtxn, status, &tasks)?;
 
         Ok(())
@@ -143,10 +139,10 @@ impl IndexScheduler {
         &self,
         wtxn: &mut RwTxn,
         kind: Kind,
-        f: impl Fn(RoaringBitmap) -> RoaringBitmap,
+        f: impl Fn(&mut RoaringBitmap),
     ) -> Result<()> {
-        let tasks = self.get_kind(&wtxn, kind)?;
-        let tasks = f(tasks);
+        let mut tasks = self.get_kind(&wtxn, kind)?;
+        f(&mut tasks);
         self.put_kind(wtxn, kind, &tasks)?;
 
         Ok(())