diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index c18399c..eece2e4 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -509,7 +509,7 @@
     return reverse_post_order_;
   }
 
-  ArrayRef<HBasicBlock* const> GetReversePostOrderSkipEntryBlock() {
+  ArrayRef<HBasicBlock* const> GetReversePostOrderSkipEntryBlock() const {
     DCHECK(GetReversePostOrder()[0] == entry_block_);
     return ArrayRef<HBasicBlock* const>(GetReversePostOrder()).SubArray(1);
   }