diff --git a/maud_lints/src/doctype.rs b/maud_lints/src/doctype.rs
index 3ccdea7..b4193b8 100644
--- a/maud_lints/src/doctype.rs
+++ b/maud_lints/src/doctype.rs
@@ -1,6 +1,5 @@
 use rustc::hir::{Expr, ExprCall, ExprLit, ExprPath};
 use rustc::lint::{LateContext, LateLintPass, LintArray, LintContext, LintPass};
-use std::ascii::AsciiExt;
 use super::util::match_def_path;
 use syntax::ast::LitKind;