diff --git a/include/llvm/Support/raw_ostream.h b/include/llvm/Support/raw_ostream.h
index 4a6b51ac609..0debc5da7a6 100644
--- a/include/llvm/Support/raw_ostream.h
+++ b/include/llvm/Support/raw_ostream.h
@@ -294,7 +294,7 @@ public:
 
   // Enable or disable colors. Once disable_colors() is called,
   // changeColor() has no effect until enable_colors() is called.
-  virtual void enable_colors(bool enable) {}
+  virtual void enable_colors(bool /*enable*/) {}
 
   //===--------------------------------------------------------------------===//
   // Subclass Interface