diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
index f4e517a0c774..a3cdbb2be038 100644
--- a/tools/testing/cxl/test/cxl.c
+++ b/tools/testing/cxl/test/cxl.c
@@ -68,15 +68,19 @@ static struct acpi_device acpi0017_mock;
 static struct acpi_device host_bridge[NR_BRIDGES] = {
 	[0] = {
 		.handle = &host_bridge[0],
+		.pnp.unique_id = "0",
 	},
 	[1] = {
 		.handle = &host_bridge[1],
+		.pnp.unique_id = "1",
 	},
 	[2] = {
 		.handle = &host_bridge[2],
+		.pnp.unique_id = "2",
 	},
 	[3] = {
 		.handle = &host_bridge[3],
+		.pnp.unique_id = "3",
 	},
 };