diff --git a/vcd.c b/vcd.c
index 0675a87..7aec3ae 100644
--- a/vcd.c
+++ b/vcd.c
@@ -1,3 +1,4 @@
+#define NAPI_VERSION 1
 #include <stdio.h>
 #include <stdlib.h>
 #include "vcd_parser.h"