diff --git a/library/aes.c b/library/aes.c
index 1eb3e20..8e3358c 100644
--- a/library/aes.c
+++ b/library/aes.c
@@ -1074,35 +1074,6 @@
 
 #if defined(MBEDTLS_CIPHER_MODE_XTS)
 
-/* Endianess with 64 bits values */
-#ifndef GET_UINT64_LE
-#define GET_UINT64_LE(n,b,i)                            \
-{                                                       \
-    (n) = ( (uint64_t) (b)[(i) + 7] << 56 )             \
-        | ( (uint64_t) (b)[(i) + 6] << 48 )             \
-        | ( (uint64_t) (b)[(i) + 5] << 40 )             \
-        | ( (uint64_t) (b)[(i) + 4] << 32 )             \
-        | ( (uint64_t) (b)[(i) + 3] << 24 )             \
-        | ( (uint64_t) (b)[(i) + 2] << 16 )             \
-        | ( (uint64_t) (b)[(i) + 1] <<  8 )             \
-        | ( (uint64_t) (b)[(i)    ]       );            \
-}
-#endif
-
-#ifndef PUT_UINT64_LE
-#define PUT_UINT64_LE(n,b,i)                            \
-{                                                       \
-    (b)[(i) + 7] = (unsigned char) ( (n) >> 56 );       \
-    (b)[(i) + 6] = (unsigned char) ( (n) >> 48 );       \
-    (b)[(i) + 5] = (unsigned char) ( (n) >> 40 );       \
-    (b)[(i) + 4] = (unsigned char) ( (n) >> 32 );       \
-    (b)[(i) + 3] = (unsigned char) ( (n) >> 24 );       \
-    (b)[(i) + 2] = (unsigned char) ( (n) >> 16 );       \
-    (b)[(i) + 1] = (unsigned char) ( (n) >>  8 );       \
-    (b)[(i)    ] = (unsigned char) ( (n)       );       \
-}
-#endif
-
 typedef unsigned char mbedtls_be128[16];
 
 /*
@@ -1118,14 +1089,14 @@
 {
     uint64_t a, b, ra, rb;
 
-    GET_UINT64_LE( a, x, 0 );
-    GET_UINT64_LE( b, x, 8 );
+    a = MBEDTLS_GET_UINT64_LE( x, 0 );
+    b = MBEDTLS_GET_UINT64_LE( x, 8 );
 
     ra = ( a << 1 )  ^ 0x0087 >> ( 8 - ( ( b >> 63 ) << 3 ) );
     rb = ( a >> 63 ) | ( b << 1 );
 
-    PUT_UINT64_LE( ra, r, 0 );
-    PUT_UINT64_LE( rb, r, 8 );
+    MBEDTLS_PUT_UINT64_LE( ra, r, 0 );
+    MBEDTLS_PUT_UINT64_LE( rb, r, 8 );
 }
 
 /*