diff --git a/src/logger.cpp b/src/logger.cpp
index 02ca7f6..30e912d 100644
--- a/src/logger.cpp
+++ b/src/logger.cpp
@@ -1,4 +1,5 @@
 #include "logger.hpp"
+#include <mutex>
 #include <unistd.h>
 #include <sys/time.h>
 #include <ctime>
@@ -6,18 +7,21 @@
 
 using namespace sc;
 
+std::mutex logger::_mtx;
+
 logger::logger(const std::string& name, loglevel level)
     : _level(level), _name(name) {}
 
 void logger::msg(loglevel level, const sc::io::trgb* color,
                  const char* file, int line, const char* func) {
     if (level >= _level) {
+        std::lock_guard<std::mutex> lock {_mtx};
         if (_topcall) {
             write_prefix(level, color, file, line, func);
         } else {
             _topcall = true;
         }
-        std::cerr << '\n';
+        std::cerr << std::endl;
         if (color) {
             std::cerr << sc::io::reset;
         }
diff --git a/src/logger.hpp b/src/logger.hpp
index c29d456..9f6b6dc 100644
--- a/src/logger.hpp
+++ b/src/logger.hpp
@@ -4,6 +4,7 @@
 #include <iostream>
 #include <string>
 #include <libscterm.hpp>
+#include <mutex>
 
 namespace sc {
 
@@ -66,6 +67,7 @@ namespace sc {
             loglevel _level {loglevel::info};
             bool _topcall {true};
             std::string _name;
+            static std::mutex _mtx;
     };
 
 }