diff --git a/repertory/repertory_test/src/app_config_test.cpp b/repertory/repertory_test/src/app_config_test.cpp
index 16a2eac3..8c540040 100644
--- a/repertory/repertory_test/src/app_config_test.cpp
+++ b/repertory/repertory_test/src/app_config_test.cpp
@@ -201,7 +201,7 @@ static void common_tests(app_config &config, provider_type prov) {
          EXPECT_STREQ("test2", value.c_str());
        }},
       {JSON_API_PORT,
-       [](const app_config &cfg) {
+       [](app_config &cfg) {
          cfg.set_api_port(0U);
          EXPECT_EQ(std::uint16_t(0U), cfg.get_api_port());