diff --git a/parse.y b/parse.y
index 391cafffc7..8eef24ebba 100644
--- a/parse.y
+++ b/parse.y
@@ -14985,34 +14985,6 @@ nd_st_key(struct parser_params *p, NODE *node)
     }
 }
 
-static VALUE
-nd_st_key_val(struct parser_params *p, NODE *node)
-{
-    switch (nd_type(node)) {
-      case NODE_LIT:
-        return RNODE_LIT(node)->nd_lit;
-      case NODE_STR:
-        return RNODE_STR(node)->nd_lit;
-      case NODE_INTEGER:
-        return rb_node_integer_literal_val(node);
-      case NODE_FLOAT:
-        return rb_node_float_literal_val(node);
-      case NODE_RATIONAL:
-        return rb_node_rational_literal_val(node);
-      case NODE_IMAGINARY:
-        return rb_node_imaginary_literal_val(node);
-      case NODE_SYM:
-        return rb_node_sym_string_val(node);
-      case NODE_LINE:
-        return rb_node_line_lineno_val(node);
-      case NODE_FILE:
-        return rb_node_file_path_val(node);
-      default:
-        rb_bug("unexpected node: %s", ruby_node_name(nd_type(node)));
-        UNREACHABLE_RETURN(0);
-    }
-}
-
 static void
 warn_duplicate_keys(struct parser_params *p, NODE *hash)
 {
@@ -15035,7 +15007,7 @@ warn_duplicate_keys(struct parser_params *p, NODE *hash)
                  st_delete(literal_keys, (key = (st_data_t)nd_st_key(p, head), &key), &data)) {
             rb_compile_warn(p->ruby_sourcefile, nd_line((NODE *)data),
                             "key %+"PRIsVALUE" is duplicated and overwritten on line %d",
-                            nd_st_key_val(p, head), nd_line(head));
+                            nd_st_key(p, head), nd_line(head));
         }
         st_insert(literal_keys, (st_data_t)key, (st_data_t)hash);
         hash = next;