diff --git a/include/compat.h b/include/compat.h
index 28a5cb15..44db7e6a 100644
--- a/include/compat.h
+++ b/include/compat.h
@@ -56,3 +56,7 @@ static inline int popcountl(uint64_t x)
     return (x * 0x01010101) >> 24;
 }
 #endif
+
+#ifndef IPTOS_ECN_CE
+# define	IPTOS_ECN_CE		0x03
+#endif
diff --git a/lib/quicly.c b/lib/quicly.c
index 1df3286a..d1c3ea6c 100644
--- a/lib/quicly.c
+++ b/lib/quicly.c
@@ -27,6 +27,7 @@
 #include <stdlib.h>
 #if !defined(_WIN32)
 # include <netinet/ip.h>
+# include <arpa/inet.h> // inet_pton for apple
 #endif
 #include "khash.h"
 #include "quicly.h"