diff --git a/test/run-tests.js b/test/run-tests.js
index 215f6af8..d97e5cf1 100755
--- a/test/run-tests.js
+++ b/test/run-tests.js
@@ -31,7 +31,7 @@ function tmpl() {
 
 function log() {
     var txt = tmpl.apply(this, arguments);
-    sys.puts(txt);
+    console.log("%s", txt);
 }
 
 function log_directory(dir) {