diff --git a/common/protob/messages-common.proto b/common/protob/messages-common.proto
index 2f08232d0..c58e2af78 100644
--- a/common/protob/messages-common.proto
+++ b/common/protob/messages-common.proto
@@ -111,7 +111,7 @@ message PinMatrixAck {
  * @next PassphraseAck
  */
 message PassphraseRequest {
-    optional bool _deprecated_on_device = 1;  // moved to PassphraseAck but left for backwards compatibility
+//    optional bool on_device = 1;  // DEPRECATED
 }
 
 /**
diff --git a/core/src/trezor/messages/PassphraseRequest.py b/core/src/trezor/messages/PassphraseRequest.py
index 27806cb9e..898f91cc2 100644
--- a/core/src/trezor/messages/PassphraseRequest.py
+++ b/core/src/trezor/messages/PassphraseRequest.py
@@ -12,15 +12,3 @@ if __debug__:
 
 class PassphraseRequest(p.MessageType):
     MESSAGE_WIRE_TYPE = 41
-
-    def __init__(
-        self,
-        _deprecated_on_device: bool = None,
-    ) -> None:
-        self._deprecated_on_device = _deprecated_on_device
-
-    @classmethod
-    def get_fields(cls) -> Dict:
-        return {
-            1: ('_deprecated_on_device', p.BoolType, 0),
-        }
diff --git a/python/src/trezorlib/messages/PassphraseRequest.py b/python/src/trezorlib/messages/PassphraseRequest.py
index a2abc1f9d..cb75b54e1 100644
--- a/python/src/trezorlib/messages/PassphraseRequest.py
+++ b/python/src/trezorlib/messages/PassphraseRequest.py
@@ -12,15 +12,3 @@ if __debug__:
 
 class PassphraseRequest(p.MessageType):
     MESSAGE_WIRE_TYPE = 41
-
-    def __init__(
-        self,
-        _deprecated_on_device: bool = None,
-    ) -> None:
-        self._deprecated_on_device = _deprecated_on_device
-
-    @classmethod
-    def get_fields(cls) -> Dict:
-        return {
-            1: ('_deprecated_on_device', p.BoolType, 0),
-        }