diff --git a/test/test_slave.html b/test/test_slave.html
index 303a58c9b..07ac87388 100644
--- a/test/test_slave.html
+++ b/test/test_slave.html
@@ -203,7 +203,7 @@ function clear(ctx) {
 /* Auto-scroll if the scrollbar is near the bottom, otherwise do nothing. */
 function checkScrolling() {
   if ((stdout.scrollHeight - stdout.scrollTop) <= stdout.offsetHeight) {
-     stdout.scrollTop = stdout.scrollHeight;
+    stdout.scrollTop = stdout.scrollHeight;
   }
 }