diff --git a/dump.h b/dump.h
index 9cb040c..bb41b3b 100644
--- a/dump.h
+++ b/dump.h
@@ -20,15 +20,21 @@
 
 void dump_ip(struct iphdr *header);
 void dump_icmp(struct icmphdr *icmp);
-void dump_udp(const struct udphdr *udp, const struct iphdr *ip, const char *payload, size_t payload_size);
-void dump_tcp(const struct tcphdr *tcp, const struct iphdr *ip, const char *payload, size_t payload_size, const char *options, size_t options_size);
+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);
 
 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 char *payload, size_t payload_size);
-void dump_tcp6(const struct tcphdr *tcp, const struct ip6_hdr *ip6, const char *payload, size_t payload_size, const char *options, size_t options_size);
+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);
 
-void logcat_hexdump(const char *info, const char *data, size_t len);
+void logcat_hexdump(const char *info, const uint8_t *data, size_t len);
 void dump_iovec(const struct iovec *iov, int iov_len);
 
 #endif /* __DUMP_H__ */