diff --git a/tests/suites/test_suite_nist_kw.function b/tests/suites/test_suite_nist_kw.function
index f1acde9..9c34ea6 100644
--- a/tests/suites/test_suite_nist_kw.function
+++ b/tests/suites/test_suite_nist_kw.function
@@ -170,10 +170,6 @@
         TEST_ASSERT( ciphertext != NULL );
     }
 
-    memset( plaintext, 0, in_len );
-    memset( ciphertext, 0, output_len );
-
-
     TEST_ASSERT( mbedtls_nist_kw_setkey( &ctx, MBEDTLS_CIPHER_ID_AES,
                                          key, 8 * sizeof( key ), 1 ) == 0 );
 
@@ -225,10 +221,6 @@
         TEST_ASSERT( ciphertext != NULL );
     }
 
-    memset( plaintext, 0, output_len );
-    memset( ciphertext, 0, in_len );
-
-
     TEST_ASSERT( mbedtls_nist_kw_setkey( &ctx, MBEDTLS_CIPHER_ID_AES,
                                          key, 8 * sizeof( key ), 0 ) == 0 );
     unwrap_ret = mbedtls_nist_kw_unwrap( &ctx, mode, ciphertext, in_len,