diff --git a/test/dm/part.c b/test/dm/part.c
index 5e4efa587c..b60687114f 100644
--- a/test/dm/part.c
+++ b/test/dm/part.c
@@ -43,7 +43,7 @@ static int dm_test_part(struct unit_test_state *uts)
 		},
 	};
 
-	ut_asserteq(1, blk_get_device_by_str("mmc", "1", &mmc_dev_desc));
+	ut_asserteq(2, blk_get_device_by_str("mmc", "2", &mmc_dev_desc));
 	if (CONFIG_IS_ENABLED(RANDOM_UUID)) {
 		gen_rand_uuid_str(parts[0].uuid, UUID_STR_FORMAT_STD);
 		gen_rand_uuid_str(parts[1].uuid, UUID_STR_FORMAT_STD);
@@ -63,7 +63,7 @@ static int dm_test_part(struct unit_test_state *uts)
 	env_set("bootdevice", "0");
 	test(0, NULL, true);
 	test(0, "", true);
-	env_set("bootdevice", "1");
+	env_set("bootdevice", "2");
 	test(1, NULL, false);
 	test(1, "", false);
 	test(1, "-", false);
@@ -74,8 +74,8 @@ static int dm_test_part(struct unit_test_state *uts)
 	test(0, ".0", true);
 	test(0, ".0:0", true);
 	test(-EINVAL, "#test1", true);
-	test(1, "1", false);
-	test(1, "1", true);
+	test(1, "2", false);
+	test(1, "2", true);
 	test(-ENOENT, "1:0", false);
 	test(0, "1:0", true);
 	test(1, "1:1", false);
@@ -85,8 +85,8 @@ static int dm_test_part(struct unit_test_state *uts)
 	test(1, "1.0:1", false);
 	test(2, "1.0:2", false);
 	test(-EINVAL, "1#bogus", false);
-	test(1, "1#test1", false);
-	test(2, "1#test2", false);
+	test(1, "2#test1", false);
+	test(2, "2#test2", false);
 	ret = 0;
 
 	env_set("bootdevice", oldbootdevice);