diff --git a/lib/capnp_c.h b/lib/capnp_c.h
index 58d1051..38ae389 100644
--- a/lib/capnp_c.h
+++ b/lib/capnp_c.h
@@ -13,6 +13,7 @@
 
 #include <stdint.h>
 #include <stdio.h>
+#include <endian.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -24,8 +25,6 @@ extern "C" {
 #define CAPN_INLINE static
 #endif
 
-#define IS_BIG_ENDIAN (*(uint16_t *)"\0\xff" < 0x100)
-
 #define CAPN_VERSION 1
 
 /* struct capn is a common structure shared between segments in the same