diff --git a/library/aria.c b/library/aria.c
index e9bcd6d..ca9e147 100644
--- a/library/aria.c
+++ b/library/aria.c
@@ -875,11 +875,11 @@
 #define ARIA_SELF_TEST_IF_FAIL              \
         {                                   \
             if( verbose )                   \
-                printf( "failed\n" );       \
+                mbedtls_printf( "failed\n" );       \
             return( 1 );                    \
         } else {                            \
             if( verbose )                   \
-                printf( "passed\n" );       \
+                mbedtls_printf( "passed\n" );       \
         }
 
 /*
@@ -908,7 +908,7 @@
     {
         /* test ECB encryption */
         if( verbose )
-            printf( "  ARIA-ECB-%d (enc): ", 128 + 64 * i );
+            mbedtls_printf( "  ARIA-ECB-%d (enc): ", 128 + 64 * i );
         mbedtls_aria_setkey_enc( &ctx, aria_test1_ecb_key, 128 + 64 * i );
         mbedtls_aria_crypt_ecb( &ctx, aria_test1_ecb_pt, blk );
         if( memcmp( blk, aria_test1_ecb_ct[i], MBEDTLS_ARIA_BLOCKSIZE ) != 0 )
@@ -916,14 +916,14 @@
 
         /* test ECB decryption */
         if( verbose )
-            printf( "  ARIA-ECB-%d (dec): ", 128 + 64 * i );
+            mbedtls_printf( "  ARIA-ECB-%d (dec): ", 128 + 64 * i );
         mbedtls_aria_setkey_dec( &ctx, aria_test1_ecb_key, 128 + 64 * i );
         mbedtls_aria_crypt_ecb( &ctx, aria_test1_ecb_ct[i], blk );
         if( memcmp( blk, aria_test1_ecb_pt, MBEDTLS_ARIA_BLOCKSIZE ) != 0 )
             ARIA_SELF_TEST_IF_FAIL;
     }
     if( verbose )
-        printf( "\n" );
+        mbedtls_printf( "\n" );
 
     /*
      * Test set 2
@@ -933,7 +933,7 @@
     {
         /* Test CBC encryption */
         if( verbose )
-            printf( "  ARIA-CBC-%d (enc): ", 128 + 64 * i );
+            mbedtls_printf( "  ARIA-CBC-%d (enc): ", 128 + 64 * i );
         mbedtls_aria_setkey_enc( &ctx, aria_test2_key, 128 + 64 * i );
         memcpy( iv, aria_test2_iv, MBEDTLS_ARIA_BLOCKSIZE );
         memset( buf, 0x55, sizeof( buf ) );
@@ -944,7 +944,7 @@
 
         /* Test CBC decryption */
         if( verbose )
-            printf( "  ARIA-CBC-%d (dec): ", 128 + 64 * i );
+            mbedtls_printf( "  ARIA-CBC-%d (dec): ", 128 + 64 * i );
         mbedtls_aria_setkey_dec( &ctx, aria_test2_key, 128 + 64 * i );
         memcpy( iv, aria_test2_iv, MBEDTLS_ARIA_BLOCKSIZE );
         memset( buf, 0xAA, sizeof( buf ) );
@@ -954,7 +954,7 @@
             ARIA_SELF_TEST_IF_FAIL;
     }
     if( verbose )
-        printf( "\n" );
+        mbedtls_printf( "\n" );
 
 #endif /* MBEDTLS_CIPHER_MODE_CBC */
 
@@ -963,7 +963,7 @@
     {
         /* Test CFB encryption */
         if( verbose )
-            printf( "  ARIA-CFB-%d (enc): ", 128 + 64 * i );
+            mbedtls_printf( "  ARIA-CFB-%d (enc): ", 128 + 64 * i );
         mbedtls_aria_setkey_enc( &ctx, aria_test2_key, 128 + 64 * i );
         memcpy( iv, aria_test2_iv, MBEDTLS_ARIA_BLOCKSIZE );
         memset( buf, 0x55, sizeof( buf ) );
@@ -975,7 +975,7 @@
 
         /* Test CFB decryption */
         if( verbose )
-            printf( "  ARIA-CFB-%d (dec): ", 128 + 64 * i );
+            mbedtls_printf( "  ARIA-CFB-%d (dec): ", 128 + 64 * i );
         mbedtls_aria_setkey_enc( &ctx, aria_test2_key, 128 + 64 * i );
         memcpy( iv, aria_test2_iv, MBEDTLS_ARIA_BLOCKSIZE );
         memset( buf, 0xAA, sizeof( buf ) );
@@ -986,7 +986,7 @@
             ARIA_SELF_TEST_IF_FAIL;
     }
     if( verbose )
-        printf( "\n" );
+        mbedtls_printf( "\n" );
 #endif /* MBEDTLS_CIPHER_MODE_CFB */
 
 #if defined(MBEDTLS_CIPHER_MODE_CTR)
@@ -994,7 +994,7 @@
     {
         /* Test CTR encryption */
         if( verbose )
-            printf( "  ARIA-CTR-%d (enc): ", 128 + 64 * i );
+            mbedtls_printf( "  ARIA-CTR-%d (enc): ", 128 + 64 * i );
         mbedtls_aria_setkey_enc( &ctx, aria_test2_key, 128 + 64 * i );
         memset( iv, 0, MBEDTLS_ARIA_BLOCKSIZE );                    // IV = 0
         memset( buf, 0x55, sizeof( buf ) );
@@ -1006,7 +1006,7 @@
 
         /* Test CTR decryption */
         if( verbose )
-            printf( "  ARIA-CTR-%d (dec): ", 128 + 64 * i );
+            mbedtls_printf( "  ARIA-CTR-%d (dec): ", 128 + 64 * i );
         mbedtls_aria_setkey_enc( &ctx, aria_test2_key, 128 + 64 * i );
         memset( iv, 0, MBEDTLS_ARIA_BLOCKSIZE );                    // IV = 0
         memset( buf, 0xAA, sizeof( buf ) );
@@ -1017,7 +1017,7 @@
             ARIA_SELF_TEST_IF_FAIL;
     }
     if( verbose )
-        printf( "\n" );
+        mbedtls_printf( "\n" );
 #endif /* MBEDTLS_CIPHER_MODE_CTR */
 
     return( 0 );