diff --git a/quickjs.c b/quickjs.c
index bcf6f7d..52d6517 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -191,7 +191,7 @@ typedef enum JSErrorEnum {
     JS_NATIVE_ERROR_COUNT, /* number of different NativeError objects */
 } JSErrorEnum;
 
-#define JS_MAX_LOCAL_VARS 65536
+#define JS_MAX_LOCAL_VARS 65535
 #define JS_STACK_SIZE_MAX 65534
 #define JS_STRING_LEN_MAX ((1 << 30) - 1)