diff --git a/index-scheduler/src/lib.rs b/index-scheduler/src/lib.rs
index 3bde39040..b0ecef0f3 100644
--- a/index-scheduler/src/lib.rs
+++ b/index-scheduler/src/lib.rs
@@ -822,7 +822,7 @@ impl IndexScheduler {
 
         // if the task doesn't delete anything and 50% of the task queue is full, we must refuse to enqueue the incomming task
         if !matches!(&kind, KindWithContent::TaskDeletion { tasks, .. } if !tasks.is_empty())
-            && (self.env.real_disk_size()? * 100) / self.env.map_size()? as u64 > 50
+            && (self.env.non_free_pages_size()? * 100) / self.env.map_size()? as u64 > 50
         {
             return Err(Error::NoSpaceLeftInTaskQueue);
         }