diff --git a/lib/libc/tests/stdbit/Makefile b/lib/libc/tests/stdbit/Makefile
index 37450056007..8dbc86528de 100644
--- a/lib/libc/tests/stdbit/Makefile
+++ b/lib/libc/tests/stdbit/Makefile
@@ -1,3 +1,5 @@
+TESTSDIR=	${TESTSBASE}/lib/libc/stdbit
+
 # ensure libc functions are tested, not clang's builtins
 CFLAGS+=	-fno-builtin