diff --git a/src/audio_core/sink/sink_stream.h b/src/audio_core/sink/sink_stream.h
index 9366ebbd37..38a4b2f517 100644
--- a/src/audio_core/sink/sink_stream.h
+++ b/src/audio_core/sink/sink_stream.h
@@ -151,7 +151,7 @@ public:
      *
      * @return The number of queued buffers.
      */
-    u32 GetQueueSize() {
+    u32 GetQueueSize() const {
         return queued_buffers.load();
     }