diff --git a/Log.cpp b/Log.cpp
index 12f8860..408f6a6 100644
--- a/Log.cpp
+++ b/Log.cpp
@@ -102,13 +102,13 @@ private:
 
 class FileOutput : public Output {
 public:
-	FileOutput(const std::string& filename, Level lvl_max)
-	    : Output(lvl_max), filename(filename), ofs(filename, std::ofstream::out | std::ofstream::app) {}
+	FileOutput(const std::string& filename, Level lvl_max, bool truncate)
+	    : Output(lvl_max), filename(filename), ofs(filename, truncate ? std::ostream::trunc : std::ostream::app) {}
 
-	FileOutput(const std::string& filename, Level lvl_min, Level lvl_max)
+	FileOutput(const std::string& filename, Level lvl_min, Level lvl_max, bool truncate)
 	    : Output(lvl_max),
 	      filename(filename),
-	      ofs(filename, std::ofstream::out | std::ofstream::app),
+	      ofs(filename, truncate ? std::ostream::trunc : std::ostream::app),
 	      lvl_min(lvl_min) {}
 
 private:
@@ -182,12 +182,12 @@ void stop() {
 	outputs.clear();
 }
 
-void addLogfile(const std::string& filename, Level max) {
-	outputs.push_back(new FileOutput(filename, max));
+void addLogfile(const std::string& filename, Level max, bool truncate) {
+	outputs.push_back(new FileOutput(filename, max, truncate));
 }
 
-void addLogfile(const std::string& filename, Level min, Level max) {
-	outputs.push_back(new FileOutput(filename, min, max));
+void addLogfile(const std::string& filename, Level min, Level max, bool truncate) {
+	outputs.push_back(new FileOutput(filename, min, max, truncate));
 }
 
 void setConsoleLogLevel(Level lvl) {
diff --git a/Log.h b/Log.h
index 0107bf4..ea7b06d 100644
--- a/Log.h
+++ b/Log.h
@@ -15,8 +15,8 @@ void init();
 // close all output streams
 void stop();
 
-void addLogfile(const std::string& filename, Level max);
-void addLogfile(const std::string& filename, Level min, Level max);
+void addLogfile(const std::string& filename, Level max, bool truncate = false);
+void addLogfile(const std::string& filename, Level min, Level max, bool truncate = false);
 
 void setConsoleLogLevel(Level lvl);
 void setColoredOutput(bool enabled);