diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index c73aa9ad86..090d18d9a3 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -8776,6 +8776,16 @@ void asymmetric_encrypt_decrypt(int key_type_arg,
     TEST_MEMORY_COMPARE(input_data->x, input_data->len,
                         output2, output2_length);
 
+    /* Try again with an output buffer that's one byte too small */
+    if (output2_size != 0) {
+        TEST_EQUAL(PSA_ERROR_BUFFER_TOO_SMALL,
+                   psa_asymmetric_decrypt(key, alg,
+                                          output, output_length,
+                                          label->x, label->len,
+                                          output2, output2_size - 1,
+                                          &output2_length));
+    }
+
 exit:
     /*
      * Key attributes may have been returned by psa_get_key_attributes()
@@ -8857,6 +8867,17 @@ void asymmetric_decrypt(int key_type_arg,
                             output, output_length);
     }
 
+    /* Try again with an output buffer that's one byte too small */
+    if (output_size != 0) {
+        TEST_EQUAL(PSA_ERROR_BUFFER_TOO_SMALL,
+                   psa_asymmetric_decrypt(key, alg,
+                                          input_data->x, input_data->len,
+                                          label->x, label->len,
+                                          output,
+                                          output_size - 1,
+                                          &output_length));
+    }
+
 exit:
     psa_reset_key_attributes(&attributes);
     psa_destroy_key(key);