diff --git a/tools/llvm-as/llvm-as.cpp b/tools/llvm-as/llvm-as.cpp
index edefe69..9ea24f3 100644
--- a/tools/llvm-as/llvm-as.cpp
+++ b/tools/llvm-as/llvm-as.cpp
@@ -40,8 +40,8 @@
 static cl::opt<bool>
 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
 
-static cl::opt<bool> Compress("compress", cl::Optional,
-       cl::desc("Compress the generated bytecode"));
+static cl::opt<bool> NoCompress("no-compress", cl::init(false),
+       cl::desc("Don't ompress the generated bytecode"));
 
 static cl::opt<bool>
 DisableVerify("disable-verify", cl::Hidden,
@@ -122,7 +122,7 @@
       return 1;
     }
    
-    WriteBytecodeToFile(M.get(), *Out, Compress);
+    WriteBytecodeToFile(M.get(), *Out, !NoCompress);
   } catch (const ParseException &E) {
     std::cerr << argv[0] << ": " << E.getMessage() << "\n";
     return 1;