diff --git a/src/audio/AudioStreamSegment.cpp b/src/audio/AudioStreamSegment.cpp
index 80fbfad..1b703a9 100644
--- a/src/audio/AudioStreamSegment.cpp
+++ b/src/audio/AudioStreamSegment.cpp
@@ -2,10 +2,10 @@
 #include <stdexcept>
 
 AudioStreamSegment::AudioStreamSegment(std::unique_ptr<AudioStream> audioStream, const TimeRange& range) :
-	audioStream(std::move(audioStream))
+	audioStream(std::move(audioStream)),
+	sampleOffset(static_cast<int64_t>(range.getStart().count()) * this->audioStream->getSampleRate() / 100),
+	sampleCount(static_cast<int64_t>(range.getLength().count()) * this->audioStream->getSampleRate() / 100)
 {
-	sampleOffset = range.getStart().count() * this->audioStream->getSampleRate() / 100;
-	sampleCount = range.getLength().count() * this->audioStream->getSampleRate() / 100;
 	seek(0);
 
 	if (sampleOffset < 0 || sampleOffset + sampleCount > this->audioStream->getSampleCount()) {
diff --git a/src/audio/AudioStreamSegment.h b/src/audio/AudioStreamSegment.h
index 3d0c553..07476ab 100644
--- a/src/audio/AudioStreamSegment.h
+++ b/src/audio/AudioStreamSegment.h
@@ -15,7 +15,7 @@ public:
 
 private:
 	std::unique_ptr<AudioStream> audioStream;
-	int64_t sampleOffset, sampleCount;
+	const int64_t sampleOffset, sampleCount;
 };
 
 std::unique_ptr<AudioStream> createSegment(std::unique_ptr<AudioStream> audioStream, const TimeRange& range);