diff --git a/lib/MC/MCNullStreamer.cpp b/lib/MC/MCNullStreamer.cpp
index d1c50e1..f38b822 100644
--- a/lib/MC/MCNullStreamer.cpp
+++ b/lib/MC/MCNullStreamer.cpp
@@ -67,7 +67,7 @@
     virtual void EmitBytes(StringRef Data, unsigned AddrSpace) {}
 
     virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
-                               bool isPCRel, unsigned AddrSpace) {}
+                               unsigned AddrSpace) {}
     virtual void EmitULEB128Value(const MCExpr *Value) {}
     virtual void EmitSLEB128Value(const MCExpr *Value) {}
     virtual void EmitGPRel32Value(const MCExpr *Value) {}