diff --git a/completions/tcpdump b/completions/tcpdump
index 8fe4ed63..7b4b4ea8 100644
--- a/completions/tcpdump
+++ b/completions/tcpdump
@@ -24,6 +24,7 @@ _tcpdump()
             return 0
             ;;
         -z)
+            compopt -o filenames
             COMPREPLY=( $( compgen -c -- "$cur" ) )
             return 0
             ;;