diff --git a/include/llvm/CodeGen/AsmPrinter.h b/include/llvm/CodeGen/AsmPrinter.h
index d4e8887288f..8ade1bd64af 100644
--- a/include/llvm/CodeGen/AsmPrinter.h
+++ b/include/llvm/CodeGen/AsmPrinter.h
@@ -223,7 +223,7 @@ namespace llvm {
     void EmitFunctionBody();
 
     /// EmitInstruction - Targets should implement this to emit instructions.
-    virtual void EmitInstruction(const MachineInstr *MI) {
+    virtual void EmitInstruction(const MachineInstr *) {
       assert(0 && "EmitInstruction not implemented");
     }
     
diff --git a/include/llvm/Pass.h b/include/llvm/Pass.h
index e822a0f3db2..8fc3a5307b3 100644
--- a/include/llvm/Pass.h
+++ b/include/llvm/Pass.h
@@ -163,7 +163,7 @@ public:
   /// an analysis interface through multiple inheritance.  If needed, it should
   /// override this to adjust the this pointer as needed for the specified pass
   /// info.
-  virtual void *getAdjustedAnalysisPointer(const PassInfo *PI) {
+  virtual void *getAdjustedAnalysisPointer(const PassInfo *) {
     return this;
   }
   virtual ImmutablePass *getAsImmutablePass() { return 0; }
diff --git a/include/llvm/Target/TargetMachine.h b/include/llvm/Target/TargetMachine.h
index c496e11926e..b671ae18ceb 100644
--- a/include/llvm/Target/TargetMachine.h
+++ b/include/llvm/Target/TargetMachine.h
@@ -189,7 +189,7 @@ public:
   /// is not supported, or false on success.
   virtual bool addPassesToEmitFile(PassManagerBase &,
                                    formatted_raw_ostream &,
-                                   CodeGenFileType Filetype,
+                                   CodeGenFileType,
                                    CodeGenOpt::Level) {
     return true;
   }