diff --git a/ghc/compiler/coreSyn/CoreSyn.hi-boot b/ghc/compiler/coreSyn/CoreSyn.hi-boot
new file mode 100644
index 0000000000000000000000000000000000000000..7d543d8a8cc58a11f3ac5347cc020625ad8bd628
--- /dev/null
+++ b/ghc/compiler/coreSyn/CoreSyn.hi-boot
@@ -0,0 +1,9 @@
+_interface_ CoreSyn 1
+_exports_
+CoreSyn SimplifiableCoreExpr ;
+_declarations_
+
+-- Needed by IdInfo
+1 type SimplifiableCoreExpr = GenCoreExpr (Id!Id, BinderInfo.BinderInfo) Id!Id BasicTypes.Unused ;
+1 data GenCoreExpr a b c ;
+