diff --git a/lib/ticks-to-tree.js b/lib/ticks-to-tree.js
index deb7392..7559ccf 100644
--- a/lib/ticks-to-tree.js
+++ b/lib/ticks-to-tree.js
@@ -4,8 +4,9 @@ const { spawnSync } = require('child_process')
 const { join } = require('path')
 const debug = require('debug')('0x: ticks-to-tree')
 const assert = require('assert')
+const escape = require('escape-string-regexp')
 
-const preloadDirRx = RegExp(join(__dirname, 'preload'))
+const preloadDirRx = RegExp(join(escape(__dirname), 'preload'))
 const internalModuleRegExp = /^.?(?:\(anonymous\)|internalBinding|NativeModule[^ ]*) [^/\\][a-zA-Z0-9_/\\-]+\.js:\d+:\d+$/
 const nodeBootstrapRegExp = / internal\/bootstrap.+\.js:\d+:\d+$/
 
diff --git a/package.json b/package.json
index e518208..434e5d2 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "debug": "^4.0.1",
     "end-of-stream": "^1.1.0",
     "env-string": "^1.0.0",
+    "escape-string-regexp": "^1.0.5",
     "execspawn": "^1.0.1",
     "has-unicode": "^2.0.1",
     "hsl-to-rgb-for-reals": "^1.1.0",