diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index ce21756911..18e3b4532d 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -1579,6 +1579,21 @@ HType HUnaryPredicate::CalculateInferredType() {
 }
 
 
+HType HInstanceOf::CalculateInferredType() {
+  return HType::Boolean();
+}
+
+
+HType HDeleteProperty::CalculateInferredType() {
+  return HType::Boolean();
+}
+
+
+HType HInstanceOfKnownGlobal::CalculateInferredType() {
+  return HType::Boolean();
+}
+
+
 HType HBitwiseBinaryOperation::CalculateInferredType() {
   return HType::TaggedNumber();
 }
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 21994839d1..00e9bd63ef 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -2789,14 +2789,12 @@ class HInstanceOf: public HTemplateInstruction<3> {
   HValue* left() { return OperandAt(1); }
   HValue* right() { return OperandAt(2); }
 
-  virtual bool EmitAtUses() {
-    return !HasSideEffects() && !HasMultipleUses();
-  }
-
   virtual Representation RequiredInputRepresentation(int index) const {
     return Representation::Tagged();
   }
 
+  virtual HType CalculateInferredType();
+
   virtual void PrintDataTo(StringStream* stream);
 
   DECLARE_CONCRETE_INSTRUCTION(InstanceOf)
@@ -2817,6 +2815,8 @@ class HInstanceOfKnownGlobal: public HUnaryOperation {
     return Representation::Tagged();
   }
 
+  virtual HType CalculateInferredType();
+
   DECLARE_CONCRETE_INSTRUCTION(InstanceOfKnownGlobal)
 
  private:
@@ -4005,6 +4005,8 @@ class HDeleteProperty: public HBinaryOperation {
     return Representation::Tagged();
   }
 
+  virtual HType CalculateInferredType();
+
   DECLARE_CONCRETE_INSTRUCTION(DeleteProperty)
 
   HValue* object() { return left(); }