diff --git a/lib/CodeGen/DwarfWriter.cpp b/lib/CodeGen/DwarfWriter.cpp
index 8683ddac206..5fcfdb56fc2 100644
--- a/lib/CodeGen/DwarfWriter.cpp
+++ b/lib/CodeGen/DwarfWriter.cpp
@@ -39,7 +39,6 @@ namespace llvm {
 //===----------------------------------------------------------------------===//
 // Forward declarations.
 //
-class CompileUnit;
 class DIE;
 
 //===----------------------------------------------------------------------===//