diff --git a/dump.h b/dump.h
index c3f0477..6b96cd2 100644
--- a/dump.h
+++ b/dump.h
@@ -31,14 +31,14 @@
 void dump_udp(const struct udphdr *udp, const struct iphdr *ip, const uint8_t *payload,
               size_t payload_size);
 void dump_tcp(const struct tcphdr *tcp, const struct iphdr *ip, const uint8_t *payload,
-              size_t payload_size, const char *options, size_t options_size);
+              size_t payload_size, const uint8_t *options, size_t options_size);
 
 void dump_ip6(struct ip6_hdr *header);
 void dump_icmp6(struct icmp6_hdr *icmp6);
 void dump_udp6(const struct udphdr *udp, const struct ip6_hdr *ip6, const uint8_t *payload,
                size_t payload_size);
 void dump_tcp6(const struct tcphdr *tcp, const struct ip6_hdr *ip6, const uint8_t *payload,
-               size_t payload_size, const char *options, size_t options_size);
+               size_t payload_size, const uint8_t *options, size_t options_size);
 
 void logcat_hexdump(const char *info, const uint8_t *data, size_t len);
 void dump_iovec(const struct iovec *iov, int iov_len);