diff --git a/src/mips/lithium-codegen-mips.h b/src/mips/lithium-codegen-mips.h
index 570fb07..b811ab6 100644
--- a/src/mips/lithium-codegen-mips.h
+++ b/src/mips/lithium-codegen-mips.h
@@ -183,7 +183,7 @@
   int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
   int GetParameterCount() const { return scope()->num_parameters(); }
 
-  void Abort(const char* format, ...);
+  void Abort(const char* reason);
   void Comment(const char* format, ...);
 
   void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
@@ -307,6 +307,10 @@
                         bool deoptimize_on_minus_zero,
                         LEnvironment* env);
 
+  void DeoptIfTaggedButNotSmi(LEnvironment* environment,
+                              HValue* value,
+                              LOperand* operand);
+
   // Emits optimized code for typeof x == "y".  Modifies input register.
   // Returns the condition on which a final split to
   // true and false label should be made, to optimize fallthrough.