diff --git a/compiler/optimizing/common_arm.h b/compiler/optimizing/common_arm.h
index 320915e..5f71cb9 100644
--- a/compiler/optimizing/common_arm.h
+++ b/compiler/optimizing/common_arm.h
@@ -17,6 +17,7 @@
 #ifndef ART_COMPILER_OPTIMIZING_COMMON_ARM_H_
 #define ART_COMPILER_OPTIMIZING_COMMON_ARM_H_
 
+#include "base/macros.h"
 #include "instruction_simplifier_shared.h"
 #include "locations.h"
 #include "nodes.h"
@@ -28,7 +29,7 @@
 #include "aarch32/macro-assembler-aarch32.h"
 #pragma GCC diagnostic pop
 
-namespace art {
+namespace art HIDDEN {
 
 using helpers::HasShifterOperand;