diff --git a/library/aria.c b/library/aria.c
index 0980362..0bd489e 100644
--- a/library/aria.c
+++ b/library/aria.c
@@ -425,6 +425,7 @@
 /*
  * Set decryption key
  */
+#if !defined(MBEDTLS_CIPHER_ENCRYPT_ONLY)
 int mbedtls_aria_setkey_dec(mbedtls_aria_context *ctx,
                             const unsigned char *key, unsigned int keybits)
 {
@@ -454,6 +455,7 @@
 
     return 0;
 }
+#endif /* !MBEDTLS_CIPHER_ENCRYPT_ONLY */
 
 /*
  * Encrypt a block
@@ -884,12 +886,18 @@
         /* test ECB decryption */
         if (verbose) {
             mbedtls_printf("  ARIA-ECB-%d (dec): ", 128 + 64 * i);
+#if defined(MBEDTLS_CIPHER_ENCRYPT_ONLY)
+            mbedtls_printf("skipped\n");
+#endif
         }
+
+#if !defined(MBEDTLS_CIPHER_ENCRYPT_ONLY)
         mbedtls_aria_setkey_dec(&ctx, aria_test1_ecb_key, 128 + 64 * i);
         mbedtls_aria_crypt_ecb(&ctx, aria_test1_ecb_ct[i], blk);
         ARIA_SELF_TEST_ASSERT(
             memcmp(blk, aria_test1_ecb_pt, MBEDTLS_ARIA_BLOCKSIZE)
             != 0);
+#endif
     }
     if (verbose) {
         mbedtls_printf("\n");