diff --git a/src/starkware/crypto/ffi/endian.h b/src/starkware/crypto/ffi/endian.h
new file mode 100644
index 0000000..14341c0
--- /dev/null
+++ b/src/starkware/crypto/ffi/endian.h
@@ -0,0 +1,8 @@
+#ifdef __APPLE__
+#include <machine/endian.h>
+#include <libkern/OSByteOrder.h>
+#define htole64(x) OSSwapHostToLittleInt64(x)
+#define le64toh(x) OSSwapLittleToHostInt64(x)
+#else
+#include <endian.h>
+#endif
diff --git a/src/starkware/crypto/ffi/utils.cc b/src/starkware/crypto/ffi/utils.cc
index 9a1e71c..746f2af 100644
--- a/src/starkware/crypto/ffi/utils.cc
+++ b/src/starkware/crypto/ffi/utils.cc
@@ -1,4 +1,4 @@
-#include <endian.h>
+#include "endian.h"
 #include <algorithm>
 #include <cstring>