diff --git a/pimd/pim_sock.h b/pimd/pim_sock.h
index 29b5aee..cfe39ad 100644
--- a/pimd/pim_sock.h
+++ b/pimd/pim_sock.h
@@ -45,7 +45,7 @@
 			   struct in_addr group_addr,
 			   struct in_addr source_addr,
 			   const char *ifname);
-int pim_socket_recvfromto(int fd, char *buf, size_t len,
+int pim_socket_recvfromto(int fd, uint8_t *buf, size_t len,
 			  struct sockaddr_in *from, socklen_t *fromlen,
 			  struct sockaddr_in *to, socklen_t *tolen,
 			  int *ifindex);