diff --git a/compat/compat.h b/compat/compat.h
index f0525bb..5aec247 100644
--- a/compat/compat.h
+++ b/compat/compat.h
@@ -17,6 +17,7 @@
 # include <machine/endian.h>
 # define le16toh(x) OSSwapLittleToHostInt16(x)
 # define le32toh(x) OSSwapLittleToHostInt32(x)
+# define le64toh(x) OSSwapLittleToHostInt64(x)
 
 #elif defined(__FreeBSD__)
 #include <sys/endian.h>