diff --git a/src/DIRAC/DataManagementSystem/Client/ConsistencyInspector.py b/src/DIRAC/DataManagementSystem/Client/ConsistencyInspector.py
index 1865c737dd3..44d93ce8f72 100644
--- a/src/DIRAC/DataManagementSystem/Client/ConsistencyInspector.py
+++ b/src/DIRAC/DataManagementSystem/Client/ConsistencyInspector.py
@@ -727,7 +727,7 @@ def _getCatalogReplicas(self, lfns):
 
     def _getCatalogMetadata(self, lfns):
         """Obtain the file metadata from the catalog while checking they exist"""
-        allMetadata = []
+        allMetadata = {}
         missingCatalogFiles = []
         zeroSizeFiles = []