diff --git a/libs/audio/source/wave/karplus_strong.cpp b/libs/audio/source/wave/karplus_strong.cpp
index 4313786d..f166b60a 100644
--- a/libs/audio/source/wave/karplus_strong.cpp
+++ b/libs/audio/source/wave/karplus_strong.cpp
@@ -19,8 +19,12 @@ namespace psemek::audio
 				: buffer_(2 * std::round(audio::frequency / frequency))
 			{
 				random::generator rng{0x4b0a763ef6573bf2ull, 0};
-				for (auto & v : buffer_)
-					v = random::uniform(rng, -1.f, 1.f);
+				for (std::size_t i = 0; i < buffer_.size(); i += 2)
+				{
+					float v = random::uniform(rng, -1.f, 1.f);
+					buffer_[i + 0] = v;
+					buffer_[i + 1] = v;
+				}
 			}
 
 			std::optional<std::size_t> length() const override