diff --git a/src/cobs_protocol.py b/src/cobs_protocol.py
index 8eafdbf..536c8df 100644
--- a/src/cobs_protocol.py
+++ b/src/cobs_protocol.py
@@ -74,6 +74,7 @@ class CobsEncoder:
             while i < len(data_with_crc) and data_with_crc[i] == self.frame_byte:
                 i += 1
 
+        output.append(self.frame_byte)  # Append end frame
         return bytes(output)