diff --git a/tests/suites/test_suite_cipher.function b/tests/suites/test_suite_cipher.function
index a7d3a6e..9a0637e 100644
--- a/tests/suites/test_suite_cipher.function
+++ b/tests/suites/test_suite_cipher.function
@@ -1011,6 +1011,9 @@
     TEST_ASSERT( memcmp( output, clear->x, clear->len ) == 0 );
 
     /* then encrypt the clear->x and make sure we get the same ciphertext and tag->x */
+    TEST_ASSERT( 0 == mbedtls_cipher_setkey( &ctx, key->x, 8 * key->len,
+                                             MBEDTLS_ENCRYPT ) );
+
     memset( output, 0xFF, sizeof( output ) );
     outlen = 0;
 
@@ -1023,7 +1026,7 @@
                                output_tag, tag->len );
     TEST_ASSERT( ret == 0 );
 
-    TEST_ASSERT( outlen == clear->len );
+    TEST_ASSERT( outlen == cipher->len );
     TEST_ASSERT( memcmp( output, cipher->x, cipher->len ) == 0 );
     TEST_ASSERT( memcmp( output_tag, tag->x, tag->len ) == 0 );