diff --git a/src/utils/BusMaster.hxx b/src/utils/BusMaster.hxx
index 96b59617f..48ea3fc41 100644
--- a/src/utils/BusMaster.hxx
+++ b/src/utils/BusMaster.hxx
@@ -96,6 +96,7 @@ public:
         {
         }
 
+#ifdef GTEST        
         /// Used in unittests to cleanly shutdown the bus master.
         void request_shutdown()
         {
@@ -111,7 +112,8 @@ public:
                 usleep(200);
             }
         }
-
+#endif
+        
         /// Sets the scheduling policy. This must be called exactly once after
         /// construction before scheduling any bus activity.
         void set_policy(unsigned num_prio, const Fixed16 *strides)