diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index a7c2d0b..e786502 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -6548,7 +6548,7 @@
 class HLoadMethodType FINAL : public HInstruction {
  public:
   HLoadMethodType(HCurrentMethod* current_method,
-                  uint16_t proto_idx,
+                  dex::ProtoIndex proto_index,
                   const DexFile& dex_file,
                   uint32_t dex_pc)
       : HInstruction(kLoadMethodType,
@@ -6556,7 +6556,7 @@
                      SideEffectsForArchRuntimeCalls(),
                      dex_pc),
         special_input_(HUserRecord<HInstruction*>(current_method)),
-        proto_idx_(proto_idx),
+        proto_index_(proto_index),
         dex_file_(dex_file) {
   }
 
@@ -6568,7 +6568,7 @@
 
   bool IsClonable() const OVERRIDE { return true; }
 
-  uint16_t GetProtoIndex() const { return proto_idx_; }
+  dex::ProtoIndex GetProtoIndex() const { return proto_index_; }
 
   const DexFile& GetDexFile() const { return dex_file_; }
 
@@ -6585,7 +6585,7 @@
   // The special input is the HCurrentMethod for kRuntimeCall.
   HUserRecord<HInstruction*> special_input_;
 
-  const uint16_t proto_idx_;
+  const dex::ProtoIndex proto_index_;
   const DexFile& dex_file_;
 };