Index: include/llvm/MCA/SourceMgr.h
===================================================================
--- include/llvm/MCA/SourceMgr.h
+++ include/llvm/MCA/SourceMgr.h
@@ -16,12 +16,11 @@
 #define LLVM_MCA_SOURCEMGR_H
 
 #include "llvm/ADT/ArrayRef.h"
+#include "llvm/MCA/Instruction.h"
 
 namespace llvm {
 namespace mca {
 
-class Instruction;
-
 typedef std::pair<unsigned, const Instruction &> SourceRef;
 
 class SourceMgr {