diff --git a/include/snipplib/utils/snplib_logger.h b/include/snipplib/utils/snplib_logger.h
index a47a29c..9e0d01c 100644
--- a/include/snipplib/utils/snplib_logger.h
+++ b/include/snipplib/utils/snplib_logger.h
@@ -3,6 +3,7 @@
 #include <list>
 #ifdef SNPLIB_SPDLOGGER
 #include <spdlog/logger.h>
+#include <spdlog/sinks/basic_file_sink.h>
 #include <spdlog/sinks/null_sink.h>
 #include <spdlog/sinks/stdout_sinks.h>
 #endif
@@ -93,14 +94,16 @@ public:
 
     static std::shared_ptr<spdlog::logger> makeLoggerFromMark(std::string const& mark, std::string const& name)
     {
-        if (mark == STDOUT_LOGGER_MARK) {
-            return std::make_shared<spdlog::stdout_logger_mt>(name);
+        if (mark.empty()) {
+            return spdlog::null_logger_mt(name);
+        } else if (mark == STDOUT_LOGGER_MARK) {
+            return spdlog::stdout_logger_mt(name);
         } else if (mark == STDERR_LOGGER_MARK) {
-            return std::make_shared<spdlog::stderr_logger_mt>(name);
+            return spdlog::stderr_logger_mt(name);
         } else if (mark == NULL_LOGGER_MARK) {
-            return std::make_shared<spdlog::null_logger_mt>(name);
+            return spdlog::null_logger_mt(name);
         } else {  // 'mark' is filename here
-            return std::make_shared<spdlog::basic_logger_mt>(name, mark);
+            return spdlog::basic_logger_mt(name, mark);
         }
     }
 
@@ -111,7 +114,7 @@ public:
     static snplib_spdlog_logger_t makeConsoleLogger(std::string const& logger_name,
                                                     R const& pattern_range = LOGGER_DEFAULT_FORMAT)
     {
-        return snplib_spdlog_logger_t(std::make_shared<spdlog::stdout_logger_mt>(logger_name), pattern_range);
+        return snplib_spdlog_logger_t(spdlog::stdout_logger_mt(logger_name), pattern_range);
     }
 
     template <std::ranges::input_range R = decltype(LOGGER_DEFAULT_FORMAT)>
@@ -119,7 +122,7 @@ public:
     static snplib_spdlog_logger_t makeConsoleErrLogger(std::string const& logger_name,
                                                        R const& pattern_range = LOGGER_DEFAULT_FORMAT)
     {
-        return snplib_spdlog_logger_t(std::make_shared<spdlog::stderr_logger_mt>(logger_name), pattern_range);
+        return snplib_spdlog_logger_t(spdlog::stderr_logger_mt(logger_name), pattern_range);
     }
 
 
@@ -127,7 +130,7 @@ public:
         requires snplib_input_char_range_c<std::ranges::range_value_t<R>>
     static snplib_spdlog_logger_t makeNullLogger(std::string const& logger_name)
     {
-        return snplib_spdlog_logger_t(std::make_shared<spdlog::null_logger_mt>(logger_name));
+        return snplib_spdlog_logger_t(spdlog::null_logger_mt(logger_name));
     }