diff --git a/catalog/C10_Catalog.py b/catalog/C10_Catalog.py
index 4648f9b34257277be458a7ead64417bff2e16bc0..3168b1746c98e70213f0eb61fa44d36d1a5d2aa6 100644
--- a/catalog/C10_Catalog.py
+++ b/catalog/C10_Catalog.py
@@ -459,7 +459,7 @@ class Catalog(CatalogBase):
 
     def free_mem(self, **kward):
         self.starDDL.freeGlobeData()
-        del self.starDLL
+        del self.starDDL
 
     def _load(self, **kwargs):
         self.objs = []
diff --git a/catalog/C9_Catalog.py b/catalog/C9_Catalog.py
index 1de5392286fb2903b3c96fc83ccad45a601ee82a..bcc15c9f38c6d32a005d2b2fdaa37274977d0b3e 100644
--- a/catalog/C9_Catalog.py
+++ b/catalog/C9_Catalog.py
@@ -471,7 +471,7 @@ class Catalog(CatalogBase):
 
     def free_mem(self, **kward):
         self.starDDL.freeGlobeData()
-        del self.starDLL
+        del self.starDDL
 
     def _load(self, **kwargs):
         self.objs = []