diff --git a/ttcn3-tcpdump-stop.sh b/ttcn3-tcpdump-stop.sh
index ac192ca45..b2a3a3e3a 100755
--- a/ttcn3-tcpdump-stop.sh
+++ b/ttcn3-tcpdump-stop.sh
@@ -49,4 +49,4 @@ done
 kill_rm_pidfile "$PIDFILE_PCAP"
 kill_rm_pidfile "$PIDFILE_NETCAT"
 
-gzip "$TTCN3_PCAP_PATH/$TESTCASE.pcap"
+gzip -f "$TTCN3_PCAP_PATH/$TESTCASE.pcap"