diff --git a/include/iptables_common.h b/include/iptables_common.h
index 6f7e4295..9099667f 100644
--- a/include/iptables_common.h
+++ b/include/iptables_common.h
@@ -12,7 +12,7 @@ enum exittype {
 /* this is a special 64bit data type that is 8-byte aligned */
 #define aligned_u64 unsigned long long __attribute__((aligned(8)))
 
-extern void exit_printhelp() __attribute__((noreturn));
+extern void exit_printhelp(void) __attribute__((noreturn));
 extern void exit_tryhelp(int) __attribute__((noreturn));
 int check_inverse(const char option[], int *invert, int *optind, int argc);
 extern int string_to_number(const char *, 
diff --git a/include/linux/netfilter_ipv4/ip_tables.h b/include/linux/netfilter_ipv4/ip_tables.h
index b8362332..00ab1518 100644
--- a/include/linux/netfilter_ipv4/ip_tables.h
+++ b/include/linux/netfilter_ipv4/ip_tables.h
@@ -15,6 +15,7 @@
 #ifndef _IPTABLES_H
 #define _IPTABLES_H
 
+#include <linux/if.h>
 #include <linux/netfilter_ipv4.h>
 
 #include <linux/netfilter/x_tables.h>