diff --git a/compiler/optimizing/side_effects_analysis.h b/compiler/optimizing/side_effects_analysis.h
index 56a01e6..47fcdc5 100644
--- a/compiler/optimizing/side_effects_analysis.h
+++ b/compiler/optimizing/side_effects_analysis.h
@@ -18,10 +18,11 @@
 #define ART_COMPILER_OPTIMIZING_SIDE_EFFECTS_ANALYSIS_H_
 
 #include "base/arena_containers.h"
+#include "base/macros.h"
 #include "nodes.h"
 #include "optimization.h"
 
-namespace art {
+namespace art HIDDEN {
 
 class SideEffectsAnalysis : public HOptimization {
  public: