diff --git a/include/llvm/Bytecode/Writer.h b/include/llvm/Bytecode/Writer.h
index 4a6f5f0f413..ad6c7741b52 100644
--- a/include/llvm/Bytecode/Writer.h
+++ b/include/llvm/Bytecode/Writer.h
@@ -29,7 +29,7 @@
 namespace llvm {
   class Module;
   void WriteBytecodeToFile(const Module *M, std::ostream &Out, 
-                           bool compress = false);
+                           bool compress = true);
 } // End llvm namespace
 
 #endif