diff --git a/source/pandoc.ads b/source/pandoc.ads
index 1d7b613..9827da6 100644
--- a/source/pandoc.ads
+++ b/source/pandoc.ads
@@ -137,6 +137,6 @@ private
      Hash => League.Strings.Hash,
      Equivalent_Keys => League.Strings."=");
 
-   Type_Mapping : constant Type_Map.Map := Type_Map.Empty_Map;
+   Type_Mapping : Type_Map.Map := Type_Map.Empty;
 
 end Pandoc;