diff --git a/zutil.h b/zutil.h
index 5fcd4e63..de42dfb6 100644
--- a/zutil.h
+++ b/zutil.h
@@ -252,7 +252,6 @@ extern const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 #    pragma intrinsic(_byteswap_ulong)
 #    define ZSWAP32(q) _byteswap_ulong(q)
 #  elif defined(__GNUC__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
-#    include <byteswap.h>
 #    define ZSWAP32(q) __builtin_bswap32(q)
 #  endif
 #endif