diff --git a/compiler/optimizing/superblock_cloner.cc b/compiler/optimizing/superblock_cloner.cc
index a5f919c..ba56eb8 100644
--- a/compiler/optimizing/superblock_cloner.cc
+++ b/compiler/optimizing/superblock_cloner.cc
@@ -22,7 +22,7 @@
 
 #include <sstream>
 
-namespace art {
+namespace art HIDDEN {
 
 using HBasicBlockMap = SuperblockCloner::HBasicBlockMap;
 using HInstructionMap = SuperblockCloner::HInstructionMap;