diff --git a/src/adlist.c b/src/adlist.c
index 7670b2c10..2e811e02e 100644
--- a/src/adlist.c
+++ b/src/adlist.c
@@ -269,9 +269,14 @@ list *listDup(list *orig)
                 listRelease(copy);
                 return NULL;
             }
-        } else
+        } else {
             value = node->value;
+        }
+        
         if (listAddNodeTail(copy, value) == NULL) {
+            /* Free value if dup succeed but listAddNodeTail failed. */
+            if (copy->free) copy->free(value);
+
             listRelease(copy);
             return NULL;
         }