diff --git a/library/bn_mul.h b/library/bn_mul.h
index bf45193..a0fa677 100644
--- a/library/bn_mul.h
+++ b/library/bn_mul.h
@@ -51,22 +51,22 @@
  */
 #if defined(MBEDTLS_HAVE_INT32)
 
-#define BYTES_TO_T_UINT_4( a, b, c, d )                       \
+#define MBEDTLS_BYTES_TO_T_UINT_4( a, b, c, d )               \
     ( (mbedtls_mpi_uint) (a) <<  0 ) |                        \
     ( (mbedtls_mpi_uint) (b) <<  8 ) |                        \
     ( (mbedtls_mpi_uint) (c) << 16 ) |                        \
     ( (mbedtls_mpi_uint) (d) << 24 )
 
-#define BYTES_TO_T_UINT_2( a, b )                   \
-    BYTES_TO_T_UINT_4( a, b, 0, 0 )
+#define MBEDTLS_BYTES_TO_T_UINT_2( a, b )                   \
+    MBEDTLS_BYTES_TO_T_UINT_4( a, b, 0, 0 )
 
-#define BYTES_TO_T_UINT_8( a, b, c, d, e, f, g, h ) \
-    BYTES_TO_T_UINT_4( a, b, c, d ),                \
-    BYTES_TO_T_UINT_4( e, f, g, h )
+#define MBEDTLS_BYTES_TO_T_UINT_8( a, b, c, d, e, f, g, h ) \
+    MBEDTLS_BYTES_TO_T_UINT_4( a, b, c, d ),                \
+    MBEDTLS_BYTES_TO_T_UINT_4( e, f, g, h )
 
 #else /* 64-bits */
 
-#define BYTES_TO_T_UINT_8( a, b, c, d, e, f, g, h ) \
+#define MBEDTLS_BYTES_TO_T_UINT_8( a, b, c, d, e, f, g, h )   \
     ( (mbedtls_mpi_uint) (a) <<  0 ) |                        \
     ( (mbedtls_mpi_uint) (b) <<  8 ) |                        \
     ( (mbedtls_mpi_uint) (c) << 16 ) |                        \
@@ -76,11 +76,11 @@
     ( (mbedtls_mpi_uint) (g) << 48 ) |                        \
     ( (mbedtls_mpi_uint) (h) << 56 )
 
-#define BYTES_TO_T_UINT_4( a, b, c, d )             \
-    BYTES_TO_T_UINT_8( a, b, c, d, 0, 0, 0, 0 )
+#define MBEDTLS_BYTES_TO_T_UINT_4( a, b, c, d )             \
+    MBEDTLS_BYTES_TO_T_UINT_8( a, b, c, d, 0, 0, 0, 0 )
 
-#define BYTES_TO_T_UINT_2( a, b )                   \
-    BYTES_TO_T_UINT_8( a, b, 0, 0, 0, 0, 0, 0 )
+#define MBEDTLS_BYTES_TO_T_UINT_2( a, b )                   \
+    MBEDTLS_BYTES_TO_T_UINT_8( a, b, 0, 0, 0, 0, 0, 0 )
 
 #endif /* bits in mbedtls_mpi_uint */