diff --git a/src/core/create_manifest_data.ts b/src/core/create_manifest_data.ts
index 367317b..fd29a9b 100644
--- a/src/core/create_manifest_data.ts
+++ b/src/core/create_manifest_data.ts
@@ -2,7 +2,7 @@ import * as fs from 'fs';
 import * as path from 'path';
 import { locations } from '../config';
 import { Page, PageComponent, ServerRoute, ManifestData } from '../interfaces';
-import { posixify } from './utils';
+import { posixify, reserved_words } from './utils';
 
 export default function create_manifest_data(cwd = locations.routes()): ManifestData {
 	const components: PageComponent[] = [];
@@ -269,7 +269,7 @@ function get_parts(part: string): Part[] {
 }
 
 function get_slug(file: string) {
-	return file
+	let name = file
 		.replace(/[\\\/]index/, '')
 		.replace(/_default([\/\\index])?\.html$/, 'index')
 		.replace(/[\/\\]/g, '_')
@@ -278,6 +278,9 @@ function get_slug(file: string) {
 		.replace(/[^a-zA-Z0-9_$]/g, c => {
 			return c === '.' ? '_' : `$${c.charCodeAt(0)}`
 		});
+
+	if (reserved_words.has(name)) name += '_';
+	return name;
 }
 
 function get_pattern(segments: Part[][], add_trailing_slash: boolean) {
diff --git a/src/core/utils.ts b/src/core/utils.ts
index fb963ae..2668e68 100644
--- a/src/core/utils.ts
+++ b/src/core/utils.ts
@@ -22,4 +22,55 @@ export function fudge_mtime(file: string) {
 		new Date(atime.getTime() - 999999),
 		new Date(mtime.getTime() - 999999)
 	);
-}
\ No newline at end of file
+}
+
+export const reserved_words = new Set([
+	'arguments',
+	'await',
+	'break',
+	'case',
+	'catch',
+	'class',
+	'const',
+	'continue',
+	'debugger',
+	'default',
+	'delete',
+	'do',
+	'else',
+	'enum',
+	'eval',
+	'export',
+	'extends',
+	'false',
+	'finally',
+	'for',
+	'function',
+	'if',
+	'implements',
+	'import',
+	'in',
+	'instanceof',
+	'interface',
+	'let',
+	'new',
+	'null',
+	'package',
+	'private',
+	'protected',
+	'public',
+	'return',
+	'static',
+	'super',
+	'switch',
+	'this',
+	'throw',
+	'true',
+	'try',
+	'typeof',
+	'var',
+	'void',
+	'while',
+	'with',
+	'yield',
+]);
\ No newline at end of file
diff --git a/test/app/routes/const.html b/test/app/routes/const.html
new file mode 100644
index 0000000..6975aae
--- /dev/null
+++ b/test/app/routes/const.html
@@ -0,0 +1 @@
+<h1>reserved words are okay as routes</h1>
\ No newline at end of file
diff --git a/test/app/routes/index.html b/test/app/routes/index.html
index e5eecde..4678fbd 100644
--- a/test/app/routes/index.html
+++ b/test/app/routes/index.html
@@ -14,6 +14,7 @@
 <a href='blog/throw-an-error'>error link</a>
 <a href='credentials?creds=include'>credentials</a>
 <a rel=prefetch class='{page === "blog"  ? "selected" : ""}' href='blog'>blog</a>
+<a href="const">const</a>
 
 <div class='hydrate-test'></div>
 
diff --git a/test/common/test.js b/test/common/test.js
index 2ad9730..abf3b27 100644
--- a/test/common/test.js
+++ b/test/common/test.js
@@ -743,6 +743,14 @@ function run({ mode, basepath = '' }) {
 						assert.equal(title, 'root preload function ran: true');
 					});
 			});
+
+			it('allows reserved words as route names', () => {
+				return nightmare.goto(`${base}/const`).init()
+					.then(() => nightmare.page.title())
+					.then(title => {
+						assert.equal(title, 'reserved words are okay as routes');
+					});
+			});
 		});
 
 		describe('headers', () => {