diff --git a/llvm/lib/MC/MCDisassembler/EDDisassembler.h b/llvm/lib/MC/MCDisassembler/EDDisassembler.h
index 2fcc09d..11d69c1 100644
--- a/llvm/lib/MC/MCDisassembler/EDDisassembler.h
+++ b/llvm/lib/MC/MCDisassembler/EDDisassembler.h
@@ -41,6 +41,7 @@
 class MCInst;
 class MCParsedAsmOperand;
 class MCStreamer;
+class MCSubtargetInfo;
 template <typename T> class SmallVectorImpl;
 class SourceMgr;
 class Target;