diff --git a/lib/Bytecode/Writer/Writer.cpp b/lib/Bytecode/Writer/Writer.cpp
index 5545834..75a25f2 100644
--- a/lib/Bytecode/Writer/Writer.cpp
+++ b/lib/Bytecode/Writer/Writer.cpp
@@ -199,7 +199,7 @@
   }
 }
 
-void WriteBytecodeToFile(const Module *C, ostream &Out) {
+void WriteBytecodeToFile(const Module *C, std::ostream &Out) {
   assert(C && "You can't write a null module!!");
 
   std::deque<unsigned char> Buffer;