diff --git a/tests/suites/test_suite_lmots.function b/tests/suites/test_suite_lmots.function
index 13d1ee4cb..616c39fa9 100644
--- a/tests/suites/test_suite_lmots.function
+++ b/tests/suites/test_suite_lmots.function
@@ -184,6 +184,8 @@ void lmots_import_export_test (  data_t * pub_key, int expected_import_rc )
         TEST_EQUAL( mbedtls_lmots_export_public_key( &ctx, exported_pub_key,
                                                    exported_pub_key_buf_size, NULL ),
                     0 );
+        TEST_EQUAL( exported_pub_key_buf_size,
+                    MBEDTLS_LMOTS_PUBLIC_KEY_LEN(MBEDTLS_LMOTS_SHA256_N32_W8) );
         ASSERT_COMPARE( pub_key->x, pub_key->len,
                         exported_pub_key, exported_pub_key_size );
         mbedtls_free(exported_pub_key);
diff --git a/tests/suites/test_suite_lms.function b/tests/suites/test_suite_lms.function
index 1e5ac42a6..baf74abc9 100644
--- a/tests/suites/test_suite_lms.function
+++ b/tests/suites/test_suite_lms.function
@@ -186,6 +186,8 @@ void lms_import_export_test (  data_t * pub_key, int expected_import_rc )
         TEST_EQUAL( mbedtls_lms_export_public_key( &ctx, exported_pub_key,
                                                    exported_pub_key_buf_size, NULL ),
                     0 );
+        TEST_EQUAL( exported_pub_key_size,
+                    MBEDTLS_LMS_PUBLIC_KEY_LEN(MBEDTLS_LMS_SHA256_M32_H10 ) );
         ASSERT_COMPARE( pub_key->x, pub_key->len,
                         exported_pub_key, exported_pub_key_size );
         mbedtls_free(exported_pub_key);