diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
index df43649ecb78..eda9b7bbab75 100644
--- a/tools/testing/selftests/bpf/progs/test_bpf_nf.c
+++ b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
@@ -190,8 +190,8 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
 	ct = alloc_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def,
 		      sizeof(opts_def));
 	if (ct) {
-		__u16 sport = bpf_get_prandom_u32();
-		__u16 dport = bpf_get_prandom_u32();
+		__u16 sport = bpf_get_prandom_u32() % 65535 + 1;
+		__u16 dport = bpf_get_prandom_u32() % 65535 + 1;
 		union nf_inet_addr saddr = {};
 		union nf_inet_addr daddr = {};
 		struct nf_conn *ct_ins;
@@ -293,8 +293,8 @@ nf_ct_opts_new_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *
 	ct = alloc_fn(ctx, &bpf_tuple, sizeof(bpf_tuple.ipv4), &opts_def,
 		      sizeof(opts_def));
 	if (ct) {
-		__u16 sport = bpf_get_prandom_u32();
-		__u16 dport = bpf_get_prandom_u32();
+		__u16 sport = bpf_get_prandom_u32() % 65535 + 1;
+		__u16 dport = bpf_get_prandom_u32() % 65535 + 1;
 		union nf_inet_addr saddr = {};
 		union nf_inet_addr daddr = {};
 		struct nf_conn *ct_ins;