diff --git a/src/drivers/pc80/tpm/acpi/tpm.asl b/src/drivers/pc80/tpm/acpi/tpm.asl
index ece63e25e3..489fec7308 100644
--- a/src/drivers/pc80/tpm/acpi/tpm.asl
+++ b/src/drivers/pc80/tpm/acpi/tpm.asl
@@ -47,7 +47,7 @@ Device (TPM)
 		Memory32Fixed (ReadWrite, CONFIG_TPM_TIS_BASE_ADDRESS, 0x5000)
 	})
 
-	Method (_CRS, 0, NotSerialized)
+	Method (_CRS, 0, Serialized)
 	{
 		OperationRegion (TREG, SystemMemory,
 				 CONFIG_TPM_TIS_BASE_ADDRESS, 0x5000)