--- a/lib/radiotap.c
+++ b/lib/radiotap.c
@@ -16,6 +16,17 @@
 #include <click/radiotap_iter.h>
 #include <click/platform.h>
 
+#if !defined(le32toh) || !defined(le16toh)
+#  if BYTE_ORDER == LITTLE_ENDIAN
+#    define le32toh(x) (x)
+#    define le16toh(x) (x)
+#  else
+#    include <byteswap.h>
+#    define le32toh(x) bswap_32(x)
+#    define le16toh(x) bswap_16(x)
+#  endif
+#endif
+
 /* function prototypes and related defs are in radiotap_iter.h */
 
 static const struct radiotap_align_size rtap_namespace_sizes[] = {