diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
index cd2f20f2707fa..7e4a0b1ee4363 100644
--- a/tools/testing/cxl/test/cxl.c
+++ b/tools/testing/cxl/test/cxl.c
@@ -558,7 +558,7 @@ static __init int cxl_test_init(void)
 
 	for (i = 0; i < ARRAY_SIZE(cxl_root_port); i++) {
 		struct platform_device *bridge =
-			cxl_host_bridge[i / NR_CXL_ROOT_PORTS];
+			cxl_host_bridge[i % ARRAY_SIZE(cxl_host_bridge)];
 		struct platform_device *pdev;
 
 		pdev = platform_device_alloc("cxl_root_port", i);