diff --git a/src/Fantomas/FormatConfig.fs b/src/Fantomas/FormatConfig.fs
index 7b27139016..8966686090 100644
--- a/src/Fantomas/FormatConfig.fs
+++ b/src/Fantomas/FormatConfig.fs
@@ -116,7 +116,7 @@ type ColumnIndentedTextWriter(tw : TextWriter) =
         member __.Dispose() =
             indentWriter.Dispose()    
 
-type Context = 
+type internal Context = 
     { Config : FormatConfig; 
       Writer : ColumnIndentedTextWriter;
       mutable BreakLines : bool;