diff --git a/bellows/cli/dump.py b/bellows/cli/dump.py
index 65c6d67f..e0d4acbb 100644
--- a/bellows/cli/dump.py
+++ b/bellows/cli/dump.py
@@ -89,7 +89,7 @@ def cb(frame_name, response):
             hdr = pure_pcapy.Pkthdr(ts_sec, ts_usec, len(data), len(data))
 
             try:
-                pcap.dump(hdr, data)
+                pcap.dump(hdr, bytes(data))
             except BrokenPipeError:
                 done_event.set()