diff --git a/base/ltfinal.dtx b/base/ltfinal.dtx
index 432af155b..d5ee5ad84 100644
--- a/base/ltfinal.dtx
+++ b/base/ltfinal.dtx
@@ -1117,18 +1117,18 @@
 \ExplSyntaxOn
 \keys_define:nn { __kernel }
   {
-    bcp47 .str_set:N = \reserves@a ,
-    lang  .str_set:N = \reserves@a
+    bcp47 .str_set:N = \reserved@a ,
+    lang  .str_set:N = \reserved@a
   }
 \exp_args_generate:n { cnx }
-\cs_set_protected:Npn \reserves@a #1
+\cs_set_protected:Npn \reserved@a #1
   {
     \cs_generate_variant:cn { text_ \str_lowercase:n {#1} case:nn } { V }
     \cs_new_protected:cpx { Make#1case \c_space_tl \c_space_tl \c_space_tl } [##1] ##2
       {
         \keys_set:nn { __kernel } {##1}
         \exp_not:c { text_ \str_lowercase:n {#1} case:Vn }
-          \exp_not:N \reserves@a {##2}
+          \exp_not:N \reserved@a {##2}
       }
      \ExpandArgs { cnx } \NewExpandableDocumentCommand
        { Make#1case }