diff --git a/programs/util/pem2der.c b/programs/util/pem2der.c
index 857cbb6..bedbcd9 100644
--- a/programs/util/pem2der.c
+++ b/programs/util/pem2der.c
@@ -20,22 +20,22 @@
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#if !defined(POLARSSL_CONFIG_FILE)
+#if !defined(MBEDTLS_CONFIG_FILE)
 #include "mbedtls/config.h"
 #else
-#include POLARSSL_CONFIG_FILE
+#include MBEDTLS_CONFIG_FILE
 #endif
 
-#if defined(POLARSSL_PLATFORM_C)
+#if defined(MBEDTLS_PLATFORM_C)
 #include "mbedtls/platform.h"
 #else
 #include <stdio.h>
-#define polarssl_free       free
-#define polarssl_malloc     malloc
-#define polarssl_printf     printf
+#define mbedtls_free       free
+#define mbedtls_malloc     malloc
+#define mbedtls_printf     printf
 #endif
 
-#if defined(POLARSSL_BASE64_C) && defined(POLARSSL_FS_IO)
+#if defined(MBEDTLS_BASE64_C) && defined(MBEDTLS_FS_IO)
 #include "mbedtls/error.h"
 #include "mbedtls/base64.h"
 
@@ -54,10 +54,10 @@
     "    output_file=%%s      default: file.der\n"      \
     "\n"
 
-#if !defined(POLARSSL_BASE64_C) || !defined(POLARSSL_FS_IO)
+#if !defined(MBEDTLS_BASE64_C) || !defined(MBEDTLS_FS_IO)
 int main( void )
 {
-    polarssl_printf("POLARSSL_BASE64_C and/or POLARSSL_FS_IO not defined.\n");
+    mbedtls_printf("MBEDTLS_BASE64_C and/or MBEDTLS_FS_IO not defined.\n");
     return( 0 );
 }
 #else
@@ -96,14 +96,14 @@
     if( s2 <= s1 || s2 > end )
         return( -1 );
 
-    ret = base64_decode( NULL, &len, (const unsigned char *) s1, s2 - s1 );
-    if( ret == POLARSSL_ERR_BASE64_INVALID_CHARACTER )
+    ret = mbedtls_base64_decode( NULL, &len, (const unsigned char *) s1, s2 - s1 );
+    if( ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER )
         return( ret );
 
     if( len > *olen )
         return( -1 );
 
-    if( ( ret = base64_decode( output, &len, (const unsigned char *) s1,
+    if( ( ret = mbedtls_base64_decode( output, &len, (const unsigned char *) s1,
                                s2 - s1 ) ) != 0 )
     {
         return( ret );
@@ -136,7 +136,7 @@
     *n = (size_t) size;
 
     if( *n + 1 == 0 ||
-        ( *buf = polarssl_malloc( *n + 1 ) ) == NULL )
+        ( *buf = mbedtls_malloc( *n + 1 ) ) == NULL )
     {
         fclose( f );
         return( -1 );
@@ -196,7 +196,7 @@
     if( argc == 0 )
     {
     usage:
-        polarssl_printf( USAGE );
+        mbedtls_printf( USAGE );
         goto exit;
     }
 
@@ -222,66 +222,66 @@
     /*
      * 1.1. Load the PEM file
      */
-    polarssl_printf( "\n  . Loading the PEM file ..." );
+    mbedtls_printf( "\n  . Loading the PEM file ..." );
     fflush( stdout );
 
     ret = load_file( opt.filename, &pem_buffer, &pem_size );
 
     if( ret != 0 )
     {
-#ifdef POLARSSL_ERROR_C
-        polarssl_strerror( ret, buf, 1024 );
+#ifdef MBEDTLS_ERROR_C
+        mbedtls_strerror( ret, buf, 1024 );
 #endif
-        polarssl_printf( " failed\n  !  load_file returned %d - %s\n\n", ret, buf );
+        mbedtls_printf( " failed\n  !  load_file returned %d - %s\n\n", ret, buf );
         goto exit;
     }
 
-    polarssl_printf( " ok\n" );
+    mbedtls_printf( " ok\n" );
 
     /*
      * 1.2. Convert from PEM to DER
      */
-    polarssl_printf( "  . Converting from PEM to DER ..." );
+    mbedtls_printf( "  . Converting from PEM to DER ..." );
     fflush( stdout );
 
     if( ( ret = convert_pem_to_der( pem_buffer, pem_size, der_buffer, &der_size ) ) != 0 )
     {
-#ifdef POLARSSL_ERROR_C
-        polarssl_strerror( ret, buf, 1024 );
+#ifdef MBEDTLS_ERROR_C
+        mbedtls_strerror( ret, buf, 1024 );
 #endif
-        polarssl_printf( " failed\n  !  convert_pem_to_der %d - %s\n\n", ret, buf );
+        mbedtls_printf( " failed\n  !  convert_pem_to_der %d - %s\n\n", ret, buf );
         goto exit;
     }
 
-    polarssl_printf( " ok\n" );
+    mbedtls_printf( " ok\n" );
 
     /*
      * 1.3. Write the DER file
      */
-    polarssl_printf( "  . Writing the DER file ..." );
+    mbedtls_printf( "  . Writing the DER file ..." );
     fflush( stdout );
 
     ret = write_file( opt.output_file, der_buffer, der_size );
 
     if( ret != 0 )
     {
-#ifdef POLARSSL_ERROR_C
-        polarssl_strerror( ret, buf, 1024 );
+#ifdef MBEDTLS_ERROR_C
+        mbedtls_strerror( ret, buf, 1024 );
 #endif
-        polarssl_printf( " failed\n  !  write_file returned %d - %s\n\n", ret, buf );
+        mbedtls_printf( " failed\n  !  write_file returned %d - %s\n\n", ret, buf );
         goto exit;
     }
 
-    polarssl_printf( " ok\n" );
+    mbedtls_printf( " ok\n" );
 
 exit:
     free( pem_buffer );
 
 #if defined(_WIN32)
-    polarssl_printf( "  + Press Enter to exit this program.\n" );
+    mbedtls_printf( "  + Press Enter to exit this program.\n" );
     fflush( stdout ); getchar();
 #endif
 
     return( ret );
 }
-#endif /* POLARSSL_BASE64_C && POLARSSL_FS_IO */
+#endif /* MBEDTLS_BASE64_C && MBEDTLS_FS_IO */