--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -693,7 +693,7 @@ void tools::gnutools::Assembler::ConstructJob(Compilation &C,
   llvm::Reloc::Model RelocationModel;
   unsigned PICLevel;
   bool IsPIE;
-  const char *DefaultAssembler = "as";
+  const char *DefaultAssembler = "gas";
   // Enforce GNU as on Solaris; the native assembler's input syntax isn't fully
   // compatible.
   if (getToolChain().getTriple().isOSSolaris())