diff --git a/tests/Makefile b/tests/Makefile
index b8fe6422..ddc806ec 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -410,9 +410,11 @@ endif
 	cd rootfs/ && env LD_PRELOAD=$(IAMROOT_LIB) PATH=$(CURDIR)/rootfs/usr/bin IAMROOT_ROOT=$(CURDIR)/rootfs                                                test-truncate64           /tmp/file0               0
 	env LD_PRELOAD=$(IAMROOT_LIB) PATH=$(CURDIR)/rootfs/usr/bin                                                                                            test-ctermid
 	cd rootfs/ && env LD_PRELOAD=$(IAMROOT_LIB) PATH=$(CURDIR)/rootfs/usr/bin IAMROOT_ROOT=$(CURDIR)/rootfs                                                test-ctermid
-ifneq ($(shell tty 2>/dev/null),not a tty)
+ifeq ($(shell test -t 1 && echo 1),1)
 	env LD_PRELOAD=$(IAMROOT_LIB) PATH=$(CURDIR)/rootfs/usr/bin                                                                                            test-ttyname 1
 	cd rootfs/ && env LD_PRELOAD=$(IAMROOT_LIB) PATH=$(CURDIR)/rootfs/usr/bin IAMROOT_ROOT=$(CURDIR)/rootfs                                                test-ttyname 1
+endif
+ifeq ($(shell test -t 2 && echo 1),1)
 	env LD_PRELOAD=$(IAMROOT_LIB) PATH=$(CURDIR)/rootfs/usr/bin                                                                                            test-ttyname_r 2
 	cd rootfs/ && env LD_PRELOAD=$(IAMROOT_LIB) PATH=$(CURDIR)/rootfs/usr/bin IAMROOT_ROOT=$(CURDIR)/rootfs                                                test-ttyname_r 2
 endif