diff --git a/tools/llvm-mca/include/Context.h b/tools/llvm-mca/include/Context.h
index 6d0245fbb01..9d64ae32f1c 100644
--- a/tools/llvm-mca/include/Context.h
+++ b/tools/llvm-mca/include/Context.h
@@ -22,7 +22,6 @@
 #include "Pipeline.h"
 #include "SourceMgr.h"
 #include "llvm/MC/MCRegisterInfo.h"
-#include "llvm/MC/MCSchedule.h"
 #include "llvm/MC/MCSubtargetInfo.h"
 #include <memory>
 
diff --git a/tools/llvm-mca/include/HardwareUnits/LSUnit.h b/tools/llvm-mca/include/HardwareUnits/LSUnit.h
index 5f78791b2c5..b348c973ee0 100644
--- a/tools/llvm-mca/include/HardwareUnits/LSUnit.h
+++ b/tools/llvm-mca/include/HardwareUnits/LSUnit.h
@@ -22,7 +22,6 @@
 namespace mca {
 
 class InstRef;
-struct InstrDesc;
 
 /// A Load/Store Unit implementing a load and store queues.
 ///
diff --git a/tools/llvm-mca/include/HardwareUnits/RegisterFile.h b/tools/llvm-mca/include/HardwareUnits/RegisterFile.h
index 7829b42c307..2a396375d89 100644
--- a/tools/llvm-mca/include/HardwareUnits/RegisterFile.h
+++ b/tools/llvm-mca/include/HardwareUnits/RegisterFile.h
@@ -26,7 +26,6 @@
 
 namespace mca {
 
-class ReadState;
 class WriteState;
 class WriteRef;
 
diff --git a/tools/llvm-mca/include/Pipeline.h b/tools/llvm-mca/include/Pipeline.h
index dc8ee0ac751..ad487e7564b 100644
--- a/tools/llvm-mca/include/Pipeline.h
+++ b/tools/llvm-mca/include/Pipeline.h
@@ -24,8 +24,6 @@
 namespace mca {
 
 class HWEventListener;
-class HWInstructionEvent;
-class HWStallEvent;
 
 /// A pipeline for a specific subtarget.
 ///