diff --git a/src/libstore/build/worker.hh b/src/libstore/build/worker.hh
index 6e7c1c626..a741b2672 100644
--- a/src/libstore/build/worker.hh
+++ b/src/libstore/build/worker.hh
@@ -148,6 +148,11 @@ private:
      */
     void wakeUp(GoalPtr goal);
 
+    /**
+     * Wait for input to become available.
+     */
+    void waitForInput();
+
 public:
 
     const Activity act;
@@ -252,11 +257,6 @@ public:
      */
     void run(const Goals & topGoals);
 
-    /**
-     * Wait for input to become available.
-     */
-    void waitForInput();
-
     /***
      * The exit status in case of failure.
      *