diff --git a/src/fsharp/ast.fs b/src/fsharp/ast.fs
index 43b7aab87d1abbd8e726d7aa6ec685b06f98eb1d..22b960d18c6f5a56bdac280b14d0000d4d98b778 100644
--- a/src/fsharp/ast.fs
+++ b/src/fsharp/ast.fs
@@ -1409,7 +1409,7 @@ and
     SynModuleDecl =
     | ModuleAbbrev of ident:Ident * longId:LongIdent * range:range
     | NestedModule of SynComponentInfo * isRecursive:bool * SynModuleDecls * bool * range:range
-    | Let of bool * SynBinding list * range:range
+    | Let of isRecursive:bool * SynBinding list * range:range
     | DoExpr of SequencePointInfoForBinding * SynExpr * range:range
     | Types of SynTypeDefn list * range:range
     | Exception of SynExceptionDefn * range:range