diff --git a/libs/audio/source/effect/truncate.cpp b/libs/audio/source/effect/truncate.cpp
index d4b55ac4..dac065c9 100644
--- a/libs/audio/source/effect/truncate.cpp
+++ b/libs/audio/source/effect/truncate.cpp
@@ -13,19 +13,21 @@ namespace psemek::audio
 		{
 			truncate_impl(stream_ptr stream, duration length)
 				: stream_(std::move(stream))
-				, length_(length)
+				, remaining_(length.samples())
+				, total_length_(stream_->played() + remaining_)
 			{}
 
 			std::optional<std::size_t> length() const override
 			{
-				return length_.samples();
+				return total_length_;
 			}
 
 			std::size_t read(util::span<float> samples) override
 			{
-				auto played = stream_->played();
-				auto max_count = std::min<std::size_t>(length_.samples() - played, samples.size());
-				return stream_->read(samples.prefix(max_count));
+				auto const max_count = std::min<std::size_t>(remaining_, samples.size());
+				auto const count = stream_->read(samples.prefix(max_count));
+				remaining_ -= count;
+				return count;
 			}
 
 			std::size_t played() const override
@@ -35,7 +37,8 @@ namespace psemek::audio
 
 		private:
 			stream_ptr stream_;
-			duration length_;
+			std::size_t remaining_;
+			std::size_t total_length_;
 		};
 
 	}