diff --git a/mapadroid/data_handler/mitm_data/holder/latest_mitm_data/LatestMitmDataEntry.py b/mapadroid/data_handler/mitm_data/holder/latest_mitm_data/LatestMitmDataEntry.py
index c343f07a4..6ad9f4e44 100644
--- a/mapadroid/data_handler/mitm_data/holder/latest_mitm_data/LatestMitmDataEntry.py
+++ b/mapadroid/data_handler/mitm_data/holder/latest_mitm_data/LatestMitmDataEntry.py
@@ -52,5 +52,5 @@ async def from_json(json_data: Union[bytes, str]) -> Optional[LatestMitmDataEntr
 
     async def to_json(self) -> bytes:
         if isinstance(self.data, bytes):
-            self.data = base64.b64encode(self.data)
+            self.data = str(base64.b64encode(self.data))
         return orjson.dumps(self.__dict__)