diff --git a/include/mbedtls/xtea.h b/include/mbedtls/xtea.h
index 02cd8d6..8adadaf 100644
--- a/include/mbedtls/xtea.h
+++ b/include/mbedtls/xtea.h
@@ -21,13 +21,13 @@
  *  with this program; if not, write to the Free Software Foundation, Inc.,
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
-#ifndef POLARSSL_XTEA_H
-#define POLARSSL_XTEA_H
+#ifndef MBEDTLS_XTEA_H
+#define MBEDTLS_XTEA_H
 
-#if !defined(POLARSSL_CONFIG_FILE)
+#if !defined(MBEDTLS_CONFIG_FILE)
 #include "config.h"
 #else
-#include POLARSSL_CONFIG_FILE
+#include MBEDTLS_CONFIG_FILE
 #endif
 
 #include <stddef.h>
@@ -39,12 +39,12 @@
 #include <inttypes.h>
 #endif
 
-#define XTEA_ENCRYPT     1
-#define XTEA_DECRYPT     0
+#define MBEDTLS_XTEA_ENCRYPT     1
+#define MBEDTLS_XTEA_DECRYPT     0
 
-#define POLARSSL_ERR_XTEA_INVALID_INPUT_LENGTH             -0x0028  /**< The data input has an invalid length. */
+#define MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH             -0x0028  /**< The data input has an invalid length. */
 
-#if !defined(POLARSSL_XTEA_ALT)
+#if !defined(MBEDTLS_XTEA_ALT)
 // Regular implementation
 //
 
@@ -59,21 +59,21 @@
 {
     uint32_t k[4];       /*!< key */
 }
-xtea_context;
+mbedtls_xtea_context;
 
 /**
  * \brief          Initialize XTEA context
  *
  * \param ctx      XTEA context to be initialized
  */
-void xtea_init( xtea_context *ctx );
+void mbedtls_xtea_init( mbedtls_xtea_context *ctx );
 
 /**
  * \brief          Clear XTEA context
  *
  * \param ctx      XTEA context to be cleared
  */
-void xtea_free( xtea_context *ctx );
+void mbedtls_xtea_free( mbedtls_xtea_context *ctx );
 
 /**
  * \brief          XTEA key schedule
@@ -81,52 +81,52 @@
  * \param ctx      XTEA context to be initialized
  * \param key      the secret key
  */
-void xtea_setup( xtea_context *ctx, const unsigned char key[16] );
+void mbedtls_xtea_setup( mbedtls_xtea_context *ctx, const unsigned char key[16] );
 
 /**
  * \brief          XTEA cipher function
  *
  * \param ctx      XTEA context
- * \param mode     XTEA_ENCRYPT or XTEA_DECRYPT
+ * \param mode     MBEDTLS_XTEA_ENCRYPT or MBEDTLS_XTEA_DECRYPT
  * \param input    8-byte input block
  * \param output   8-byte output block
  *
  * \return         0 if successful
  */
-int xtea_crypt_ecb( xtea_context *ctx,
+int mbedtls_xtea_crypt_ecb( mbedtls_xtea_context *ctx,
                     int mode,
                     const unsigned char input[8],
                     unsigned char output[8] );
 
-#if defined(POLARSSL_CIPHER_MODE_CBC)
+#if defined(MBEDTLS_CIPHER_MODE_CBC)
 /**
  * \brief          XTEA CBC cipher function
  *
  * \param ctx      XTEA context
- * \param mode     XTEA_ENCRYPT or XTEA_DECRYPT
+ * \param mode     MBEDTLS_XTEA_ENCRYPT or MBEDTLS_XTEA_DECRYPT
  * \param length   the length of input, multiple of 8
  * \param iv       initialization vector for CBC mode
  * \param input    input block
  * \param output   output block
  *
  * \return         0 if successful,
- *                 POLARSSL_ERR_XTEA_INVALID_INPUT_LENGTH if the length % 8 != 0
+ *                 MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH if the length % 8 != 0
  */
-int xtea_crypt_cbc( xtea_context *ctx,
+int mbedtls_xtea_crypt_cbc( mbedtls_xtea_context *ctx,
                     int mode,
                     size_t length,
                     unsigned char iv[8],
                     const unsigned char *input,
                     unsigned char *output);
-#endif /* POLARSSL_CIPHER_MODE_CBC */
+#endif /* MBEDTLS_CIPHER_MODE_CBC */
 
 #ifdef __cplusplus
 }
 #endif
 
-#else  /* POLARSSL_XTEA_ALT */
+#else  /* MBEDTLS_XTEA_ALT */
 #include "xtea_alt.h"
-#endif /* POLARSSL_XTEA_ALT */
+#endif /* MBEDTLS_XTEA_ALT */
 
 #ifdef __cplusplus
 extern "C" {
@@ -137,7 +137,7 @@
  *
  * \return         0 if successful, or 1 if the test failed
  */
-int xtea_self_test( int verbose );
+int mbedtls_xtea_self_test( int verbose );
 
 #ifdef __cplusplus
 }