diff --git a/tests/suites/test_suite_psa_crypto.data b/tests/suites/test_suite_psa_crypto.data
index 3dd3866520..bf40aebc79 100644
--- a/tests/suites/test_suite_psa_crypto.data
+++ b/tests/suites/test_suite_psa_crypto.data
@@ -2746,6 +2746,11 @@ PSA symmetric encrypt/decrypt multipart: AES-CBC-nopad, 16 bytes, good
 depends_on:PSA_WANT_ALG_CBC_NO_PADDING:PSA_WANT_KEY_TYPE_AES
 cipher_verify_output_multipart:PSA_ALG_CBC_NO_PADDING:PSA_KEY_TYPE_AES:"2b7e151628aed2a6abf7158809cf4f3c":"6bc1bee22e409f96e93d7e117393172a":16
 
+# Encrypt 48 bytes total, initially 16. This forces both calls to update() to output data.
+PSA symmetric encrypt/decrypt multipart: AES-CBC-nopad, 48 bytes, good
+depends_on:PSA_WANT_ALG_CBC_NO_PADDING:PSA_WANT_KEY_TYPE_AES
+cipher_verify_output_multipart:PSA_ALG_CBC_NO_PADDING:PSA_KEY_TYPE_AES:"2b7e151628aed2a6abf7158809cf4f3c":"6bc1bee22e409f96e93d7e117393172a6bc1bee22e409f96e93d7e117393172a6bc1bee22e409f96e93d7e117393172a":16
+
 PSA symmetric encrypt/decrypt multipart: AES-CBC-PKCS#7, 16 bytes
 depends_on:PSA_WANT_ALG_CBC_PKCS7:PSA_WANT_KEY_TYPE_AES
 cipher_verify_output_multipart:PSA_ALG_CBC_PKCS7:PSA_KEY_TYPE_AES:"2b7e151628aed2a6abf7158809cf4f3c":"6bc1bee22e409f96e93d7e117393172a":16
diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index b605c68333..63a65a1a16 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -4615,7 +4615,8 @@ void cipher_verify_output_multipart(int alg_arg,
     PSA_ASSERT(psa_cipher_update(&operation1,
                                  input->x + first_part_size,
                                  input->len - first_part_size,
-                                 output1, output1_buffer_size,
+                                 output1 + output1_length,
+                                 output1_buffer_size - output1_length,
                                  &function_output_length));
     TEST_LE_U(function_output_length,
               PSA_CIPHER_UPDATE_OUTPUT_SIZE(key_type,
@@ -4661,7 +4662,8 @@ void cipher_verify_output_multipart(int alg_arg,
     PSA_ASSERT(psa_cipher_update(&operation2,
                                  output1 + first_part_size,
                                  output1_length - first_part_size,
-                                 output2, output2_buffer_size,
+                                 output2 + output2_length,
+                                 output2_buffer_size - output2_length,
                                  &function_output_length));
     TEST_LE_U(function_output_length,
               PSA_CIPHER_UPDATE_OUTPUT_SIZE(key_type,