1 files changed, 1 insertions, 2 deletions
diff --git a/tools/opt/NewPMDriver.h b/tools/opt/NewPMDriver.h
index 349a7b1267f8e..66a470d49ba8b 100644
--- a/tools/opt/NewPMDriver.h
+++ b/tools/opt/NewPMDriver.h
@@ -21,9 +21,8 @@
 #ifndef LLVM_TOOLS_OPT_NEWPMDRIVER_H
 #define LLVM_TOOLS_OPT_NEWPMDRIVER_H
 
-#include "llvm/ADT/StringRef.h"
-
 namespace llvm {
+class StringRef;
 class LLVMContext;
 class Module;
 class TargetMachine;