diff --git a/lib/Bitcode/Writer/BitWriter.cpp b/lib/Bitcode/Writer/BitWriter.cpp
index d7b1510..727ea3f 100644
--- a/lib/Bitcode/Writer/BitWriter.cpp
+++ b/lib/Bitcode/Writer/BitWriter.cpp
@@ -17,7 +17,7 @@
 /*===-- Operations on modules ---------------------------------------------===*/
 
 int LLVMWriteBitcodeToFile(LLVMModuleRef M, const char *Path) {
-  std::ofstream OS(Path);
+  std::ofstream OS(Path, std::ios_base::out|std::ios::trunc|std::ios::binary);
   
   if (!OS.fail())
     WriteBitcodeToFile(unwrap(M), OS);