diff --git a/include/llvm/MC/MCObjectStreamer.h b/include/llvm/MC/MCObjectStreamer.h
index 44c43b2269d..0968a592598 100644
--- a/include/llvm/MC/MCObjectStreamer.h
+++ b/include/llvm/MC/MCObjectStreamer.h
@@ -18,7 +18,6 @@
 namespace llvm {
 class MCAssembler;
 class MCCodeEmitter;
-class MCSectionData;
 class MCSubtargetInfo;
 class MCExpr;
 class MCFragment;