diff --git a/.gitignore b/.gitignore
index 3858bb7b8..6dd5ff928 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,7 +29,6 @@ plugins/acpi-facp/tests/
 plugins/ata/tests/
 plugins/dfu/tests/
 plugins/nvme/tests/
-plugins/synaptics-mst/tests/
 plugins/synaptics-prometheus/tests/
 plugins/tpm-eventlog/tests/
 plugins/uefi-dbx/tests/
diff --git a/plugins/synaptics-mst/fu-self-test.c b/plugins/synaptics-mst/fu-self-test.c
index ffdaa7a5b..7c810b980 100644
--- a/plugins/synaptics-mst/fu-self-test.c
+++ b/plugins/synaptics-mst/fu-self-test.c
@@ -203,6 +203,7 @@ main(int argc, char **argv)
 	/* only critical and error are fatal */
 	g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL);
 	testdatadir = g_test_build_filename(G_TEST_DIST, "tests", NULL);
+	(void)g_setenv("FWUPD_SYSFSFWDIR", testdatadir, TRUE);
 	(void)g_setenv("FWUPD_SYSFSFWATTRIBDIR", testdatadir, TRUE);
 
 	g_assert_cmpint(g_mkdir_with_parents("/tmp/fwupd-self-test/var/lib/fwupd", 0755), ==, 0);
diff --git a/plugins/synaptics-mst/tests/dmi b/plugins/synaptics-mst/tests/dmi
new file mode 120000
index 000000000..545fadeaf
--- /dev/null
+++ b/plugins/synaptics-mst/tests/dmi
@@ -0,0 +1 @@
+../../../libfwupdplugin/tests/dmi/
\ No newline at end of file
diff --git a/src/tests/dmi b/src/tests/dmi
new file mode 120000
index 000000000..f9a592bbc
--- /dev/null
+++ b/src/tests/dmi
@@ -0,0 +1 @@
+../../libfwupdplugin/tests/dmi/
\ No newline at end of file