diff --git a/ble/att.h b/ble/att.h
index b8f733819..d488b5e70 100644
--- a/ble/att.h
+++ b/ble/att.h
@@ -161,6 +161,7 @@ extern "C" {
 #define GAP_APPEARANCE_UUID            0x2a01
 #define GAP_PERIPHERAL_PRIVACY_FLAG    0x2a02
 #define GAP_RECONNECTION_ADDRESS_UUID  0x2a03
+#define GAP_PERIPHERAL_PREFERRED_CONNECTION_PARAMETERS_UUID 0x2a04
 
 
 typedef struct att_connection {
diff --git a/ble/compile-gatt.py b/ble/compile-gatt.py
index 16de78c04..07f632855 100755
--- a/ble/compile-gatt.py
+++ b/ble/compile-gatt.py
@@ -41,6 +41,7 @@ assigned_uuids = {
     'GATT_SERVICE'         : 0x1801, 
     'GAP_DEVICE_NAME'      : 0x2a00,
     'GAP_APPEARANCE'       : 0x2a01,
+    'GAP_PERIPHERAL_PREFERRED_CONNECTION_PARAMETERS' : 0x2A04,
     'GATT_SERVICE_CHANGED' : 0x2a05,
 }