diff --git a/src/ip.cpp b/src/ip.cpp
index 5c57bcb..252ce11 100644
--- a/src/ip.cpp
+++ b/src/ip.cpp
@@ -387,7 +387,7 @@ void IP::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU* pare
             protocol(new_flag);
     }
     
-    #if __FreeBSD__ || defined(__FreeBSD_kernel__)
+    #if __FreeBSD__ || defined(__FreeBSD_kernel__) || __APPLE__
         if(!parent)
             total_sz = Endian::host_to_be<uint16_t>(total_sz);
     #endif