diff --git a/plugins/samplesource/filesource/filesourcethread.cpp b/plugins/samplesource/filesource/filesourcethread.cpp
index 1845e0df0..ddda282e3 100644
--- a/plugins/samplesource/filesource/filesourcethread.cpp
+++ b/plugins/samplesource/filesource/filesourcethread.cpp
@@ -98,7 +98,7 @@ void FileSourceThread::setSamplerate(int samplerate)
 	//m_samplerate = samplerate;
 }
 
-void FileSourceThread::setBuffer(int chunksize)
+void FileSourceThread::setBuffer(std::size_t chunksize)
 {
     if (chunksize > m_bufsize)
     {
diff --git a/plugins/samplesource/filesource/filesourcethread.h b/plugins/samplesource/filesource/filesourcethread.h
index b0af61a59..560605218 100644
--- a/plugins/samplesource/filesource/filesourcethread.h
+++ b/plugins/samplesource/filesource/filesourcethread.h
@@ -40,7 +40,7 @@ public:
 	void startWork();
 	void stopWork();
 	void setSamplerate(int samplerate);
-    void setBuffer(int chunksize);
+    void setBuffer(std::size_t chunksize);
 	bool isRunning() const { return m_running; }
 	std::size_t getSamplesCount() const { return m_samplesCount; }
 	void setSamplesCount(int samplesCount) { m_samplesCount = samplesCount; }