diff --git a/jsarray.c b/jsarray.c
index 03963cd..e8efdb7 100644
--- a/jsarray.c
+++ b/jsarray.c
@@ -103,7 +103,7 @@ static void Ap_join(js_State *J)
 		seplen = 1;
 	}
 
-	if (len == 0) {
+	if (len <= 0) {
 		js_pushliteral(J, "");
 		return;
 	}