diff --git a/src/sink.cpp b/src/sink.cpp
--- a/src/sink.cpp
+++ b/src/sink.cpp
@@ -53,7 +53,7 @@ void Sink::setNumChannels(unsigned nc, b
     }
 }
 
-void Sink::setSource(const Source* s)
+void Sink::setSource(Source* s)
 {
     Q_ASSERT((source == nullptr) != (s == nullptr));
     source = s;