diff --git a/sys/dev/amdsmn/amdsmn.c b/sys/dev/amdsmn/amdsmn.c
index a0a7b9db60f..4f85c830b32 100644
--- a/sys/dev/amdsmn/amdsmn.c
+++ b/sys/dev/amdsmn/amdsmn.c
@@ -60,6 +60,7 @@
 #define	PCI_DEVICE_ID_AMD_17H_M30H_ROOT		0x1480	/* Also M70H, F19H M00H/M20H */
 #define	PCI_DEVICE_ID_AMD_17H_M60H_ROOT		0x1630
 #define	PCI_DEVICE_ID_AMD_19H_M10H_ROOT		0x14a4
+#define	PCI_DEVICE_ID_AMD_19H_M40H_ROOT		0x14b5
 #define	PCI_DEVICE_ID_AMD_19H_M60H_ROOT		0x14d8
 #define	PCI_DEVICE_ID_AMD_19H_M70H_ROOT		0x14e8
 
@@ -111,6 +112,12 @@ static const struct pciid {
 		.amdsmn_addr_reg = F17H_SMN_ADDR_REG,
 		.amdsmn_data_reg = F17H_SMN_DATA_REG,
 	},
+	{
+		.amdsmn_vendorid = CPU_VENDOR_AMD,
+		.amdsmn_deviceid = PCI_DEVICE_ID_AMD_19H_M40H_ROOT,
+		.amdsmn_addr_reg = F17H_SMN_ADDR_REG,
+		.amdsmn_data_reg = F17H_SMN_DATA_REG,
+	},
 	{
 		.amdsmn_vendorid = CPU_VENDOR_AMD,
 		.amdsmn_deviceid = PCI_DEVICE_ID_AMD_19H_M60H_ROOT,