diff --git a/lib/MC/MachObjectWriter.cpp b/lib/MC/MachObjectWriter.cpp
index 824928a..9ea79f0 100644
--- a/lib/MC/MachObjectWriter.cpp
+++ b/lib/MC/MachObjectWriter.cpp
@@ -192,6 +192,8 @@
     : Writer(_Writer), OS(Writer->getStream()), Is64Bit(_Is64Bit) {
   }
 
+  virtual ~MachObjectWriterImpl() {}
+
   void Write8(uint8_t Value) { Writer->Write8(Value); }
   void Write16(uint16_t Value) { Writer->Write16(Value); }
   void Write32(uint32_t Value) { Writer->Write32(Value); }