diff --git a/index.js b/index.js
index 5aa8bda..f6c93f1 100644
--- a/index.js
+++ b/index.js
@@ -37,6 +37,7 @@ const normalizeList = require('./lib/normalizeList')
 const parseHttpDate = require('./lib/parseHttpDate')
 const parseTokenList = require('./lib/parseTokenList')
 const setHeaders = require('./lib/setHeaders')
+const hasTrailingSlash = require('./lib/hasTrailingSlash')
 
 /**
  * Path function references.
@@ -222,17 +223,6 @@ SendStream.prototype.error = function error (status, err) {
   res.end(doc[0])
 }
 
-/**
- * Check if the pathname ends with "/".
- *
- * @return {boolean}
- * @private
- */
-
-SendStream.prototype.hasTrailingSlash = function hasTrailingSlash () {
-  return this.path[this.path.length - 1] === '/'
-}
-
 /**
  * Check if this is a conditional GET request.
  *
@@ -409,7 +399,7 @@ SendStream.prototype.redirect = function redirect (path) {
     return
   }
 
-  if (this.hasTrailingSlash()) {
+  if (hasTrailingSlash(this.path)) {
     this.error(403)
     return
   }
@@ -515,7 +505,7 @@ SendStream.prototype.pipe = function pipe (res) {
   }
 
   // index file support
-  if (this._index.length && this.hasTrailingSlash()) {
+  if (this._index.length && hasTrailingSlash(this.path)) {
     this.sendIndex(path)
     return res
   }
diff --git a/lib/hasTrailingSlash.js b/lib/hasTrailingSlash.js
new file mode 100644
index 0000000..d314fb5
--- /dev/null
+++ b/lib/hasTrailingSlash.js
@@ -0,0 +1,11 @@
+'use strict'
+
+/**
+ * Check if the pathname ends with "/".
+ *
+ * @return {boolean}
+ * @private
+ */
+module.exports = function hasTrailingSlash (path) {
+  return path[path.length - 1] === '/'
+}
diff --git a/types/index.d.ts b/types/index.d.ts
index 4f6b670..4bcc62d 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -118,11 +118,6 @@ declare namespace send {
      */
     error(status: number, error?: Error): void;
 
-    /**
-     * Check if the pathname ends with "/".
-     */
-    hasTrailingSlash(): boolean;
-
     /**
      * Check if this is a conditional GET request.
      */