diff --git a/lib/MC/MachObjectWriter.cpp b/lib/MC/MachObjectWriter.cpp
index 4bb0535..61df5bb 100644
--- a/lib/MC/MachObjectWriter.cpp
+++ b/lib/MC/MachObjectWriter.cpp
@@ -1360,7 +1360,7 @@
                                                               IsPCRel, DF);
 }
 
-void MachObjectWriter::WriteObject(const MCAssembler &Asm,
+void MachObjectWriter::WriteObject(MCAssembler &Asm,
                                    const MCAsmLayout &Layout) {
   ((MachObjectWriterImpl*) Impl)->WriteObject(Asm, Layout);
 }