diff --git a/Makefile b/Makefile
index d69894b..8cf583a 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,8 @@ test:
 .phony: root_test
 root_test:
 	./build.bash
-	cd tests/root_test && go test -c && sudo ./root_test.test -test.v
+	# Need to use TMPDIR=/var/tmp as TestOverlay fails on tmpfs.
+	cd tests/root_test && go test -c && sudo TMPDIR=/var/tmp ./root_test.test -test.v
 
 .phony: format
 format:
diff --git a/tests/root_test/root_test.go b/tests/root_test/root_test.go
index c4ed7db..23b44d0 100644
--- a/tests/root_test/root_test.go
+++ b/tests/root_test/root_test.go
@@ -375,7 +375,7 @@ func TestOverlay(t *testing.T) {
 		t.Skip("must run as root")
 	}
 	cDir := test_helpers.InitFS(t)
-	if syscallcompat.DetectQuirks(cDir)|syscallcompat.QuirkNoUserXattr != 0 {
+	if syscallcompat.DetectQuirks(cDir)&syscallcompat.QuirkNoUserXattr != 0 {
 		t.Logf("No user xattrs! overlay mount will likely fail.")
 	}
 	os.Chmod(cDir, 0755)