diff --git a/tvix/castore/src/import/mod.rs b/tvix/castore/src/import/mod.rs
index 87e289911..05a21c9df 100644
--- a/tvix/castore/src/import/mod.rs
+++ b/tvix/castore/src/import/mod.rs
@@ -134,6 +134,11 @@ where
         }
     };
 
+    assert!(
+        entries.count().await == 0,
+        "Tvix bug: left over elements in the stream"
+    );
+
     assert!(
         directories.is_empty(),
         "Tvix bug: left over directories after processing ingestion stream"