diff --git a/lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.h b/lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.h
index bce84222807..81211cc026d 100644
--- a/lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.h
+++ b/lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.h
@@ -17,8 +17,8 @@
 #include <cstdint>
 
 namespace llvm {
-class InstrItinerary;
-class InstrStage;
+struct InstrItinerary;
+struct InstrStage;
 class MCAsmBackend;
 class MCCodeEmitter;
 class MCContext;