diff --git a/tool/net/demo/binarytrees.lua b/tool/net/demo/binarytrees.lua
index 10cbe8532..d66c09d36 100644
--- a/tool/net/demo/binarytrees.lua
+++ b/tool/net/demo/binarytrees.lua
@@ -140,7 +140,7 @@ local function BinaryTreesDemo()
Write('
\r\n')
Write('%g seconds, or
\r\n' % {nanos / 1e9})
Write('%g milliseconds, or
\r\n' % {nanos / 1e6})
- Write('%g microseconds, or
\r\n' % {nanos / 1e6})
+ Write('%g microseconds, or
\r\n' % {nanos / 1e3})
Write('%d nanoseconds\r\n' % {nanos})
Write('unix.clock_gettime() #1\r\n')
Write('%d, %d\r\n' % {secs1, nanos1})