diff --git a/tools/driver/cc1as_main.cpp b/tools/driver/cc1as_main.cpp
index 8ddcc47..14ff1e0 100644
--- a/tools/driver/cc1as_main.cpp
+++ b/tools/driver/cc1as_main.cpp
@@ -282,7 +282,7 @@
   // FIXME: This is not pretty. MCContext has a ptr to MCObjectFileInfo and
   // MCObjectFileInfo needs a MCContext reference in order to initialize itself.
   OwningPtr<MCObjectFileInfo> MOFI(new MCObjectFileInfo());
-  MCContext Ctx(*MAI, *MRI, MOFI.get());
+  MCContext Ctx(*MAI, *MRI, MOFI.get(), &SrcMgr);
   // FIXME: Assembler behavior can change with -static.
   MOFI->InitMCObjectFileInfo(Opts.Triple,
                              Reloc::Default, CodeModel::Default, Ctx);