diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 656a3e471b..3786700a69 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -4921,10 +4921,6 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     Args.ClaimAllArgs(options::OPT_MJ);
   }
 
-  // For FLANG, we want to pass -O1 as the default, iff no -O was given
-  if (IsFlang && (!Args.getLastArg(options::OPT_O_Group)))
-      CmdArgs.push_back("-O1");
-
   if (IsCuda) {
     // We have to pass the triple of the host if compiling for a CUDA device and
     // vice-versa.