diff --git a/core/src/trezor/wire/thp/interface_manager.py b/core/src/trezor/wire/thp/interface_manager.py
index e36521e1c2..957d9de273 100644
--- a/core/src/trezor/wire/thp/interface_manager.py
+++ b/core/src/trezor/wire/thp/interface_manager.py
@@ -1,7 +1,11 @@
 from typing import TYPE_CHECKING
 
-import trezorble as ble
 import usb
+from trezor import utils
+
+if utils.USE_BLE:
+    import trezorble as ble
+
 
 _WIRE_INTERFACE_USB = b"\x01"
 _WIRE_INTERFACE_BLE = b"\x02"
@@ -17,11 +21,13 @@ def decode_iface(cached_iface: bytes) -> WireInterface:
         if iface is None:
             raise RuntimeError("There is no valid USB WireInterface")
         return iface
-    elif cached_iface == _WIRE_INTERFACE_BLE:
-        iface = ble.interface
-        if iface is None:
-            raise RuntimeError("There is no valid BLE WireInterface")
-        return iface
+    if utils.USE_BLE:
+        if cached_iface == _WIRE_INTERFACE_BLE:
+            iface = ble.interface
+            if iface is None:
+                raise RuntimeError("There is no valid BLE WireInterface")
+            return iface
+
     raise Exception("Unknown WireInterface")
 
 
@@ -29,6 +35,7 @@ def encode_iface(iface: WireInterface) -> bytes:
     """Encode wire interface into bytes."""
     if iface is usb.iface_wire:
         return _WIRE_INTERFACE_USB
-    if iface is ble.interface:
-        return _WIRE_INTERFACE_BLE
+    if utils.USE_BLE:
+        if iface is ble.interface:
+            return _WIRE_INTERFACE_BLE
     raise Exception("Unknown WireInterface")