diff --git a/quickjs/ckb_module.c b/quickjs/ckb_module.c
index db0dee9..b638c31 100644
--- a/quickjs/ckb_module.c
+++ b/quickjs/ckb_module.c
@@ -460,7 +460,7 @@ static JSValue syscall_pipe(JSContext *ctx, JSValueConst this_value, int argc, J
 static JSValue syscall_inherited_fds(JSContext *ctx, JSValueConst this_value, int argc, JSValueConst *argv) {
     int err = 0;
     uint64_t fds[32];
-    uint64_t length;
+    uint64_t length = 32;
     err = ckb_inherited_fds(fds, &length);
     CHECK(err);
     JSValue obj = JS_NewArray(ctx);