diff --git a/src/thread/pipipelinethread.h b/src/thread/pipipelinethread.h
index add23a61..648a7671 100644
--- a/src/thread/pipipelinethread.h
+++ b/src/thread/pipipelinethread.h
@@ -116,6 +116,8 @@ public:
 protected:
 	virtual Tout calc(Tin &v, bool &ok) = 0;
 
+	uint max_size;
+
 private:
 	void begin() {cnt = 0;}
 	void run() {
@@ -153,7 +155,6 @@ private:
 	PIMutex mutex_l;
 	bool wait_next_pipe;
 	bool next_overload;
-	uint max_size;
 	ullong cnt;
 	PIQueue<Tin> in;
 	Tout last;