diff --git a/libs/audio/source/combine/concat.cpp b/libs/audio/source/combine/concat.cpp
index 907d978d..3ad9bef7 100644
--- a/libs/audio/source/combine/concat.cpp
+++ b/libs/audio/source/combine/concat.cpp
@@ -38,8 +38,9 @@ namespace psemek::audio
 
 				for (; index_ != streams_.size(); ++index_)
 				{
-					count += streams_[index_]->read(samples);
-					samples.consume(count);
+					auto read = streams_[index_]->read(samples);
+					count += read;
+					samples.consume(read);
 					if (samples.empty())
 						break;
 				}