diff --git a/src/sfizz/Logger.cpp b/src/sfizz/Logger.cpp
index ab96ded0..5e7bce70 100644
--- a/src/sfizz/Logger.cpp
+++ b/src/sfizz/Logger.cpp
@@ -86,7 +86,7 @@ sfz::Logger::~Logger()
 }
 
 
-void sfz::Logger::logCallbackTime(std::chrono::duration<double> duration, int numVoices, int numSamples)
+void sfz::Logger::logCallbackTime(std::chrono::duration<double> duration, int numVoices, size_t numSamples)
 {
     if (!loggingEnabled)
         return;
diff --git a/src/sfizz/Logger.h b/src/sfizz/Logger.h
index a1a1bae7..693760cf 100644
--- a/src/sfizz/Logger.h
+++ b/src/sfizz/Logger.h
@@ -45,7 +45,7 @@ struct CallbackTime
 {
     std::chrono::duration<double> duration;
     int numVoices;
-    int numSamples;
+    size_t numSamples;
 };
 
 class Logger
@@ -57,7 +57,7 @@ public:
     void clear();
     void enableLogging();
     void disableLogging();
-    void logCallbackTime(std::chrono::duration<double> duration, int numVoices, int numSamples);
+    void logCallbackTime(std::chrono::duration<double> duration, int numVoices, size_t numSamples);
     void logFileTime(std::chrono::duration<double> waitDuration, std::chrono::duration<double> loadDuration, uint32_t fileSize, absl::string_view filename);
 private:
     void moveEvents();
diff --git a/src/sfizz/Synth.cpp b/src/sfizz/Synth.cpp
index b146f16e..63101517 100644
--- a/src/sfizz/Synth.cpp
+++ b/src/sfizz/Synth.cpp
@@ -237,7 +237,7 @@ bool sfz::Synth::loadSfzFile(const fs::path& file)
         return false;
 
     resources.filePool.setRootDirectory(this->originalDirectory);
-    resources.logger.setPrefix(file.filename());
+    resources.logger.setPrefix(file.filename().string());
 
     auto currentRegion = regions.begin();
     auto lastRegion = regions.rbegin();