diff --git a/userland/testbin/Makefile b/userland/testbin/Makefile
index bfb4b03..cc522ca 100644
--- a/userland/testbin/Makefile
+++ b/userland/testbin/Makefile
@@ -12,7 +12,7 @@ SUBDIRS=add argtest badcall bigexec bigfile bigfork bigseek bloat conman \
 	quinthuge quintmat quintsort randcall redirect rmdirtest rmtest \
 	sbrktest schedpong shll sink sort sparsefile spinner sty tail tictac \
 	triplehuge triplemat triplesort usemtest waiter zero \
-	consoletest shelltest opentest readwritetest closetest
+	consoletest shelltest opentest readwritetest closetest stacktest
 
 # But not:
 #    userthreads    (no support in kernel API in base system)