diff --git a/compiler/optimizing/scheduler.cc b/compiler/optimizing/scheduler.cc
index d656898..116f526 100644
--- a/compiler/optimizing/scheduler.cc
+++ b/compiler/optimizing/scheduler.cc
@@ -32,7 +32,7 @@
 #include "scheduler_arm.h"
 #endif
 
-namespace art {
+namespace art HIDDEN {
 
 void SchedulingGraph::AddDependency(SchedulingNode* node,
                                     SchedulingNode* dependency,