--- include/libiptc/libiptc.h
+++ include/libiptc/libiptc.h
@@ -15,6 +15,17 @@
 extern "C" {
 #endif
 
+#ifndef IPT_MIN_ALIGN
+/* ipt_entry has pointers and u_int64_t's in it, so if you align to
+   it, you'll also align to any crazy matches and targets someone
+   might write */
+#define IPT_MIN_ALIGN (__alignof__(struct ipt_entry))
+#endif
+
+#ifndef IPT_ALIGN
+#define IPT_ALIGN(s) (((s) + ((IPT_MIN_ALIGN)-1)) & ~((IPT_MIN_ALIGN)-1))
+#endif
+
 struct iptc_handle;
 
 typedef char ipt_chainlabel[32];