diff --git a/tcshrc.prompt.defs b/tcshrc.prompt.defs
index f218133..293463f 100644
--- a/tcshrc.prompt.defs
+++ b/tcshrc.prompt.defs
@@ -128,7 +128,8 @@ set referencechars_raw="${referencechars_raw} 2620"
 
 _debug "Building unicode sigils table...."
 if( ! $?CSHENV_NO_UNICODE_PRINTF ) then
-	set referencechars_original=( `printf "${referencechars_raw:as/ / \\u/}"` )
+	_debug "${referencechars_raw:as/ / 0000/:as/ 00001/ 0001/:as/ / \U/}"
+	set referencechars_original=( `printf "${referencechars_raw:as/ / 0000/:as/ 00001/ 0001/:as/ / \\U/}"` )
 else
 	# Safe fallback for when there's no unicode printf
 	set referencechars_original="A B C D X Y Z"