diff --git a/samples/pktgen/pktgen_sample01_simple.sh b/samples/pktgen/pktgen_sample01_simple.sh
index cdb9f497f87d..66cb707479e6 100755
--- a/samples/pktgen/pktgen_sample01_simple.sh
+++ b/samples/pktgen/pktgen_sample01_simple.sh
@@ -76,7 +76,7 @@ if [ -n "$DST_PORT" ]; then
     pg_set $DEV "udp_dst_max $UDP_DST_MAX"
 fi
 
-[ ! -z "$UDP_CSUM" ] && pg_set $dev "flag UDPCSUM"
+[ ! -z "$UDP_CSUM" ] && pg_set $DEV "flag UDPCSUM"
 
 # Setup random UDP port src range
 pg_set $DEV "flag UDPSRC_RND"