diff --git a/compiler/optimizing/select_generator_test.cc b/compiler/optimizing/select_generator_test.cc
index b18d41a..fc9e150 100644
--- a/compiler/optimizing/select_generator_test.cc
+++ b/compiler/optimizing/select_generator_test.cc
@@ -17,12 +17,13 @@
 #include "select_generator.h"
 
 #include "base/arena_allocator.h"
+#include "base/macros.h"
 #include "builder.h"
 #include "nodes.h"
 #include "optimizing_unit_test.h"
 #include "side_effects_analysis.h"
 
-namespace art {
+namespace art HIDDEN {
 
 class SelectGeneratorTest : public OptimizingUnitTest {
  protected: