diff --git a/src/libsystemd/sd-device/test-sd-device.c b/src/libsystemd/sd-device/test-sd-device.c
index 7bc61354067..3bd3761f3be 100644
--- a/src/libsystemd/sd-device/test-sd-device.c
+++ b/src/libsystemd/sd-device/test-sd-device.c
@@ -182,6 +182,10 @@ TEST(sd_device_enumerator_devices) {
 
         assert_se(sd_device_enumerator_new(&e) >= 0);
         assert_se(sd_device_enumerator_allow_uninitialized(e) >= 0);
+        /* On some CI environments, it seems some loop block devices and corresponding bdi devices sometimes
+         * disappear during running this test. Let's exclude them here for stability. */
+        assert_se(sd_device_enumerator_add_match_subsystem(e, "bdi", false) >= 0);
+        assert_se(sd_device_enumerator_add_nomatch_sysname(e, "loop*") >= 0);
         FOREACH_DEVICE(e, d)
                 test_sd_device_one(d);
 }
@@ -208,6 +212,8 @@ static void test_sd_device_enumerator_filter_subsystem_one(
 
         assert_se(sd_device_enumerator_new(&e) >= 0);
         assert_se(sd_device_enumerator_add_match_subsystem(e, subsystem, true) >= 0);
+        if (streq(subsystem, "block"))
+                assert_se(sd_device_enumerator_add_nomatch_sysname(e, "loop*") >= 0);
 
         FOREACH_DEVICE(e, d) {
                 const char *syspath;
@@ -250,6 +256,9 @@ TEST(sd_device_enumerator_filter_subsystem) {
 
         assert_se(subsystems = hashmap_new(&string_hash_ops));
         assert_se(sd_device_enumerator_new(&e) >= 0);
+        /* See comments in TEST(sd_device_enumerator_devices). */
+        assert_se(sd_device_enumerator_add_match_subsystem(e, "bdi", false) >= 0);
+        assert_se(sd_device_enumerator_add_nomatch_sysname(e, "loop*") >= 0);
 
         FOREACH_DEVICE(e, d) {
                 const char *syspath, *subsystem;