diff --git a/llvm/include/llvm-c/TargetMachine.h b/llvm/include/llvm-c/TargetMachine.h
--- a/llvm/include/llvm-c/TargetMachine.h
+++ b/llvm/include/llvm-c/TargetMachine.h
@@ -136,7 +136,9 @@
   wraps several c++ only classes (among them a file stream). Returns any
   error in ErrorMessage. Use LLVMDisposeMessage to dispose the message. */
 LLVMBool LLVMTargetMachineEmitToFile(LLVMTargetMachineRef T, LLVMModuleRef M,
-  char *Filename, LLVMCodeGenFileType codegen, char **ErrorMessage);
+                                     const char *Filename,
+                                     LLVMCodeGenFileType codegen,
+                                     char **ErrorMessage);
 
 /** Compile the LLVM IR stored in \p M and store the result in \p OutMemBuf. */
 LLVMBool LLVMTargetMachineEmitToMemoryBuffer(LLVMTargetMachineRef T, LLVMModuleRef M,
diff --git a/llvm/lib/Target/TargetMachineC.cpp b/llvm/lib/Target/TargetMachineC.cpp
--- a/llvm/lib/Target/TargetMachineC.cpp
+++ b/llvm/lib/Target/TargetMachineC.cpp
@@ -213,7 +213,9 @@
 }
 
 LLVMBool LLVMTargetMachineEmitToFile(LLVMTargetMachineRef T, LLVMModuleRef M,
-  char* Filename, LLVMCodeGenFileType codegen, char** ErrorMessage) {
+                                     const char *Filename,
+                                     LLVMCodeGenFileType codegen,
+                                     char **ErrorMessage) {
   std::error_code EC;
   raw_fd_ostream dest(Filename, EC, sys::fs::OF_None);
   if (EC) {