diff --git a/astarte/device/device_grpc.py b/astarte/device/device_grpc.py
index a508860a..bc4559da 100644
--- a/astarte/device/device_grpc.py
+++ b/astarte/device/device_grpc.py
@@ -162,7 +162,7 @@ def remove_interface(self, interface_name: str) -> None:
         if interface_name in self.__interfaces_bins:
             del self.__interfaces_bins[interface_name]
         if self.__connection_state is ConnectionState.CONNECTED:
-            interfaces_name = InterfacesName(names=[json.dumps(interface_name).encode()])
+            interfaces_name = InterfacesName(names=[interface_name.encode()])
             self.__msghub_stub.RemoveInterfaces(interfaces_name)
 
     def connect(self) -> None: