diff --git a/gucc/tests/unit-crypttab_gen.cpp b/gucc/tests/unit-crypttab_gen.cpp
index f0694e5..43cf5fd 100644
--- a/gucc/tests/unit-crypttab_gen.cpp
+++ b/gucc/tests/unit-crypttab_gen.cpp
@@ -32,7 +32,7 @@ luks-6bdb3301-8efb-4b84-b0b7-4caeef26fd6f UUID=6bdb3301-8efb-4b84-b0b7-4caeef26f
 )"sv;
 
 int main() {
-    auto callback_sink = std::make_shared<spdlog::sinks::callback_sink_mt>([](const spdlog::details::log_msg& msg) {
+    auto callback_sink = std::make_shared<spdlog::sinks::callback_sink_mt>([](const spdlog::details::log_msg&) {
         // noop
     });
     spdlog::set_default_logger(std::make_shared<spdlog::logger>("default", callback_sink));
diff --git a/gucc/tests/unit-fstab_gen.cpp b/gucc/tests/unit-fstab_gen.cpp
index 4c3fb99..bbb5288 100644
--- a/gucc/tests/unit-fstab_gen.cpp
+++ b/gucc/tests/unit-fstab_gen.cpp
@@ -82,7 +82,7 @@ UUID=8EFB-4B84                            /boot          vfat    defaults,noatim
 )"sv;
 
 int main() {
-    auto callback_sink = std::make_shared<spdlog::sinks::callback_sink_mt>([](const spdlog::details::log_msg& msg) {
+    auto callback_sink = std::make_shared<spdlog::sinks::callback_sink_mt>([](const spdlog::details::log_msg&) {
         // noop
     });
     spdlog::set_default_logger(std::make_shared<spdlog::logger>("default", callback_sink));
diff --git a/gucc/tests/unit-grub_config_gen.cpp b/gucc/tests/unit-grub_config_gen.cpp
index ef7b4ef..b50391a 100644
--- a/gucc/tests/unit-grub_config_gen.cpp
+++ b/gucc/tests/unit-grub_config_gen.cpp
@@ -134,7 +134,7 @@ inline auto filtered_res(std::string_view content) noexcept -> std::string {
 }
 
 int main() {
-    auto callback_sink = std::make_shared<spdlog::sinks::callback_sink_mt>([](const spdlog::details::log_msg& msg) {
+    auto callback_sink = std::make_shared<spdlog::sinks::callback_sink_mt>([](const spdlog::details::log_msg&) {
         // noop
     });
     spdlog::set_default_logger(std::make_shared<spdlog::logger>("default", callback_sink));