diff --git a/gcc/ada/exp_unst.adb b/gcc/ada/exp_unst.adb
index b01cfc13bf9..7acb0656262 100644
--- a/gcc/ada/exp_unst.adb
+++ b/gcc/ada/exp_unst.adb
@@ -643,7 +643,9 @@ package body Exp_Unst is
 
                   --  Conversion case
 
-                  elsif Nkind (N) = N_Type_Conversion then
+                  elsif Nkind (N) in
+                          N_Type_Conversion | N_Unchecked_Type_Conversion
+                  then
                      Note_Uplevel_Bound (Expression (N), Ref);
                   end if;
                end Note_Uplevel_Bound;