diff --git a/utils/TableGen/SetTheory.h b/utils/TableGen/SetTheory.h
index e2309b2af6f..f6123c7d914 100644
--- a/utils/TableGen/SetTheory.h
+++ b/utils/TableGen/SetTheory.h
@@ -55,7 +55,7 @@
 namespace llvm {
 
 class DagInit;
-struct Init;
+class Init;
 class Record;
 class RecordKeeper;