diff --git a/include/llvm/BasicBlock.h b/include/llvm/BasicBlock.h
index 30c1fc783e7..55ecd4052e6 100644
--- a/include/llvm/BasicBlock.h
+++ b/include/llvm/BasicBlock.h
@@ -139,7 +139,7 @@ public:
   void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
 
   /// Methods for support type inquiry through isa, cast, and dyn_cast:
-  static inline bool classof(const BasicBlock *BB) { return true; }
+  static inline bool classof(const BasicBlock *) { return true; }
   static inline bool classof(const Value *V) {
     return V->getValueType() == Value::BasicBlockVal;
   }
diff --git a/include/llvm/Constant.h b/include/llvm/Constant.h
index fc63b35b203..f9d8441a675 100644
--- a/include/llvm/Constant.h
+++ b/include/llvm/Constant.h
@@ -75,7 +75,7 @@ public:
   /// use Value::replaceAllUsesWith, which automatically dispatches to this
   /// method as needed.
   ///
-  virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
+  virtual void replaceUsesOfWithOnConstant(Value *, Value *, Use *) {
     // Provide a default implementation for constants (like integers) that
     // cannot use any other values.  This cannot be called at runtime, but needs
     // to be here to avoid link errors.
diff --git a/include/llvm/GlobalValue.h b/include/llvm/GlobalValue.h
index f85bd5edef4..ca92b21c7fb 100644
--- a/include/llvm/GlobalValue.h
+++ b/include/llvm/GlobalValue.h
@@ -101,7 +101,7 @@ public:
   void removeDeadConstantUsers();
 
   // Methods for support type inquiry through isa, cast, and dyn_cast:
-  static inline bool classof(const GlobalValue *T) { return true; }
+  static inline bool classof(const GlobalValue *) { return true; }
   static inline bool classof(const Value *V) {
     return V->getValueType() == Value::FunctionVal ||
            V->getValueType() == Value::GlobalVariableVal;
diff --git a/include/llvm/Instruction.h b/include/llvm/Instruction.h
index ef6285261d0..d9cb5859211 100644
--- a/include/llvm/Instruction.h
+++ b/include/llvm/Instruction.h
@@ -157,7 +157,7 @@ public:
   void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
 
   /// Methods for support type inquiry through isa, cast, and dyn_cast:
-  static inline bool classof(const Instruction *I) { return true; }
+  static inline bool classof(const Instruction *) { return true; }
   static inline bool classof(const Value *V) {
     return V->getValueType() >= Value::InstructionVal;
   }