diff --git a/compiler/optimizing/code_generator_arm.h b/compiler/optimizing/code_generator_arm.h
index a96ecbd..1d10293 100644
--- a/compiler/optimizing/code_generator_arm.h
+++ b/compiler/optimizing/code_generator_arm.h
@@ -138,7 +138,7 @@
       : HGraphVisitor(graph), codegen_(codegen) {}
 
 #define DECLARE_VISIT_INSTRUCTION(name, super)     \
-  void Visit##name(H##name* instr);
+  void Visit##name(H##name* instr) OVERRIDE;
 
   FOR_EACH_CONCRETE_INSTRUCTION_COMMON(DECLARE_VISIT_INSTRUCTION)
   FOR_EACH_CONCRETE_INSTRUCTION_ARM(DECLARE_VISIT_INSTRUCTION)
@@ -168,7 +168,7 @@
   InstructionCodeGeneratorARM(HGraph* graph, CodeGeneratorARM* codegen);
 
 #define DECLARE_VISIT_INSTRUCTION(name, super)     \
-  void Visit##name(H##name* instr);
+  void Visit##name(H##name* instr) OVERRIDE;
 
   FOR_EACH_CONCRETE_INSTRUCTION_COMMON(DECLARE_VISIT_INSTRUCTION)
   FOR_EACH_CONCRETE_INSTRUCTION_ARM(DECLARE_VISIT_INSTRUCTION)
diff --git a/compiler/optimizing/code_generator_mips64.h b/compiler/optimizing/code_generator_mips64.h
index c724a21..ae7c568 100644
--- a/compiler/optimizing/code_generator_mips64.h
+++ b/compiler/optimizing/code_generator_mips64.h
@@ -146,12 +146,18 @@
       : HGraphVisitor(graph), codegen_(codegen) {}
 
 #define DECLARE_VISIT_INSTRUCTION(name, super)     \
-  void Visit##name(H##name* instr);
+  void Visit##name(H##name* instr) OVERRIDE;
 
-  FOR_EACH_CONCRETE_INSTRUCTION(DECLARE_VISIT_INSTRUCTION)
+  FOR_EACH_CONCRETE_INSTRUCTION_COMMON(DECLARE_VISIT_INSTRUCTION)
+  FOR_EACH_CONCRETE_INSTRUCTION_MIPS64(DECLARE_VISIT_INSTRUCTION)
 
 #undef DECLARE_VISIT_INSTRUCTION
 
+  void VisitInstruction(HInstruction* instruction) OVERRIDE {
+    LOG(FATAL) << "Unreachable instruction " << instruction->DebugName()
+               << " (id " << instruction->GetId() << ")";
+  }
+
  private:
   void HandleInvoke(HInvoke* invoke);
   void HandleBinaryOp(HBinaryOperation* operation);
@@ -171,12 +177,18 @@
   InstructionCodeGeneratorMIPS64(HGraph* graph, CodeGeneratorMIPS64* codegen);
 
 #define DECLARE_VISIT_INSTRUCTION(name, super)     \
-  void Visit##name(H##name* instr);
+  void Visit##name(H##name* instr) OVERRIDE;
 
-  FOR_EACH_CONCRETE_INSTRUCTION(DECLARE_VISIT_INSTRUCTION)
+  FOR_EACH_CONCRETE_INSTRUCTION_COMMON(DECLARE_VISIT_INSTRUCTION)
+  FOR_EACH_CONCRETE_INSTRUCTION_MIPS64(DECLARE_VISIT_INSTRUCTION)
 
 #undef DECLARE_VISIT_INSTRUCTION
 
+  void VisitInstruction(HInstruction* instruction) OVERRIDE {
+    LOG(FATAL) << "Unreachable instruction " << instruction->DebugName()
+               << " (id " << instruction->GetId() << ")";
+  }
+
   Mips64Assembler* GetAssembler() const { return assembler_; }
 
  private:
diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index f2e9e22..95ea966 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -964,6 +964,8 @@
 
 #define FOR_EACH_CONCRETE_INSTRUCTION_ARM64(M)
 
+#define FOR_EACH_CONCRETE_INSTRUCTION_MIPS64(M)
+
 #define FOR_EACH_CONCRETE_INSTRUCTION_X86(M)
 
 #define FOR_EACH_CONCRETE_INSTRUCTION_X86_64(M)
@@ -972,6 +974,7 @@
   FOR_EACH_CONCRETE_INSTRUCTION_COMMON(M)                               \
   FOR_EACH_CONCRETE_INSTRUCTION_ARM(M)                                  \
   FOR_EACH_CONCRETE_INSTRUCTION_ARM64(M)                                \
+  FOR_EACH_CONCRETE_INSTRUCTION_MIPS64(M)                               \
   FOR_EACH_CONCRETE_INSTRUCTION_X86(M)                                  \
   FOR_EACH_CONCRETE_INSTRUCTION_X86_64(M)