diff --git a/compiler/optimizing/instruction_simplifier_arm64.h b/compiler/optimizing/instruction_simplifier_arm64.h
index 374638a..8d93c01 100644
--- a/compiler/optimizing/instruction_simplifier_arm64.h
+++ b/compiler/optimizing/instruction_simplifier_arm64.h
@@ -17,11 +17,10 @@
 #ifndef ART_COMPILER_OPTIMIZING_INSTRUCTION_SIMPLIFIER_ARM64_H_
 #define ART_COMPILER_OPTIMIZING_INSTRUCTION_SIMPLIFIER_ARM64_H_
 
-#include "base/macros.h"
 #include "nodes.h"
 #include "optimization.h"
 
-namespace art HIDDEN {
+namespace art {
 namespace arm64 {
 
 class InstructionSimplifierArm64 : public HOptimization {