diff --git a/lib/string-parsing/escape-substring.js b/lib/string-parsing/escape-substring.js
index 9a51e87..9f4d4b8 100644
--- a/lib/string-parsing/escape-substring.js
+++ b/lib/string-parsing/escape-substring.js
@@ -1,7 +1,5 @@
 'use strict'
 
-const escapeFilterValue = require('../utils/escape-filter-value')
-
 /**
  * In an extensible filter, the righthand size of the filter can have
  * substrings delimeted by `*` characters, e.g. `foo=*foo*bar*baz*`. This
@@ -25,9 +23,9 @@ module.exports = function escapeSubstring (str) {
     throw Error('extensible filter delimiter missing')
   }
 
-  out.initial = escapeFilterValue(fields.shift())
-  out.final = escapeFilterValue(fields.pop())
-  Array.prototype.push.apply(out.any, fields.map(escapeFilterValue))
+  out.initial = fields.shift()
+  out.final = fields.pop()
+  Array.prototype.push.apply(out.any, fields)
 
   return out
 }
diff --git a/lib/string-parsing/escape-substring.test.js b/lib/string-parsing/escape-substring.test.js
index 0c429ae..9857096 100644
--- a/lib/string-parsing/escape-substring.test.js
+++ b/lib/string-parsing/escape-substring.test.js
@@ -11,19 +11,25 @@ tap.test('throws if separator missing', async t => {
 })
 
 tap.test('escapes an initial only string', async t => {
-  const expected = { initial: 'f\\28o', final: '', any: [] }
+  const expected = { initial: 'f(o', final: '', any: [] }
   const result = escapeSubstring('f(o*')
   t.strictSame(expected, result)
 })
 
 tap.test('escapes string with initial and final', async t => {
-  const expected = { initial: 'f\\28o', final: 'bar', any: [] }
+  const expected = { initial: 'f(o', final: 'bar', any: [] }
   const result = escapeSubstring('f(o*bar')
   t.strictSame(expected, result)
 })
 
 tap.test('escapes string with initial, final, and any', async t => {
-  const expected = { initial: 'f\\28o', final: 'b\\29f', any: ['bar', 'baz'] }
+  const expected = { initial: 'f(o', final: 'b)f', any: ['bar', 'baz'] }
   const result = escapeSubstring('f(o*bar*baz*b)f')
   t.strictSame(expected, result)
 })
+
+tap.test('escapes string with any only and containing a non ascii character', async t => {
+  const expected = { initial: '', final: '', any: ['réseau'] }
+  const result = escapeSubstring('*réseau*')
+  t.strictSame(expected, result)
+})
diff --git a/lib/string-parsing/parse-expression.test.js b/lib/string-parsing/parse-expression.test.js
index e90d33e..2690329 100644
--- a/lib/string-parsing/parse-expression.test.js
+++ b/lib/string-parsing/parse-expression.test.js
@@ -102,5 +102,14 @@ tap.test('parses filter with non-ascii characters', t => {
     t.equal(result.toString(), '(cn=\\c3\\b8)')
   })
 
+  t.test('*réseau*', async t => {
+    const result = parse('cn=*réseau*')
+    t.type(result, SubstringFilter)
+    t.equal(result.toString(), '(cn=*r\\c3\\a9seau*)')
+    t.equal(result.initial, '')
+    t.equal(result.final, '')
+    t.strictSame(result.any, ['réseau'])
+  })
+
   t.end()
 })