diff --git a/inc/driver_preamble.inc b/inc/driver_preamble.inc
index e7874fb..0cfa3b6 100644
--- a/inc/driver_preamble.inc
+++ b/inc/driver_preamble.inc
@@ -323,6 +323,7 @@ handle_sys_file:
         jmp     invoke_system_file
 
 not_found:
+        MLI_CALL CLOSE, close_params
         jmp     quit
 .endproc