diff --git a/knx_iot_virtual_pb.c b/knx_iot_virtual_pb.c
index 0b51e2d..541c2c1 100644
--- a/knx_iot_virtual_pb.c
+++ b/knx_iot_virtual_pb.c
@@ -431,7 +431,14 @@ app_init(void)
   
   /* set the firmware version 0.7.0 */
   oc_core_set_device_fwv(0, 0, 7, 0);
-  
+
+  char mid[5];
+  strncpy(mid, g_serial_number, 5); // mid = first 4 digits of sn
+  mid[4] = '\0';
+  long int mid_num = strtol(mid, NULL, 16);
+
+  /* manufactorer id */
+  oc_core_set_device_mid(0, (uint32_t)mid_num);
 
   /* set the hardware type*/
   //                         123456789012
diff --git a/knx_iot_virtual_sa.c b/knx_iot_virtual_sa.c
index 1e1d40c..6638023 100644
--- a/knx_iot_virtual_sa.c
+++ b/knx_iot_virtual_sa.c
@@ -475,6 +475,14 @@ app_init(void)
   
   /* set the firmware version 0.7.0 */
   oc_core_set_device_fwv(0, 0, 7, 0);
+
+  char mid[5];
+  strncpy(mid, g_serial_number, 5); // mid = first 4 digits of sn
+  mid[4] = '\0';
+  long int mid_num = strtol(mid, NULL, 16);
+
+  /* manufactorer id */
+  oc_core_set_device_mid(0, (uint32_t)mid_num);
   
   /* set the hardware type*/
   //                         123456789012