diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
index 34b48027b3de..403cd3608772 100644
--- a/tools/testing/cxl/test/mem.c
+++ b/tools/testing/cxl/test/mem.c
@@ -52,11 +52,11 @@ static struct cxl_cel_entry mock_cel[] = {
 	},
 	{
 		.opcode = cpu_to_le16(CXL_MBOX_OP_INJECT_POISON),
-		.effect = cpu_to_le16(0),
+		.effect = cpu_to_le16(EFFECT(2)),
 	},
 	{
 		.opcode = cpu_to_le16(CXL_MBOX_OP_CLEAR_POISON),
-		.effect = cpu_to_le16(0),
+		.effect = cpu_to_le16(EFFECT(2)),
 	},
 };