diff --git a/wwwbasic.mjs b/wwwbasic.mjs
index c3be255..960071d 100644
--- a/wwwbasic.mjs
+++ b/wwwbasic.mjs
@@ -1876,6 +1876,7 @@ function Basic(code, options) {
       }
       Invoke('Line', Arguments('PdpIS'));
     } else if (tok == 'sleep') {
+      Next();
       Invoke('Sleep', Arguments('i'));
       NewOp();
     } else if (tok == 'swap') {