diff --git a/main/cdr.c b/main/cdr.c
index 056ca32a9c..2e6209551d 100644
--- a/main/cdr.c
+++ b/main/cdr.c
@@ -3054,7 +3054,7 @@ int ast_cdr_serialize_variables(const char *channel_name, struct ast_str **buf,
 			total++;
 		}
 	}
-
+	ao2_unlock(cdr);
 	return total;
 }