diff --git a/src/JShrink/Minifier.php b/src/JShrink/Minifier.php
index 55b3873..86734da 100644
--- a/src/JShrink/Minifier.php
+++ b/src/JShrink/Minifier.php
@@ -537,7 +537,7 @@ protected function saveRegex()
      */
     protected static function isAlphaNumeric($char)
     {
-        return preg_match('/^[\w\$]$/', $char) === 1 || $char == '/';
+        return preg_match('/^[\w\$\pL]$/', $char) === 1 || $char == '/';
     }
 
     /**
diff --git a/tests/Resources/jshrink/input/utf_chars.js b/tests/Resources/jshrink/input/utf_chars.js
new file mode 100644
index 0000000..dd9dc8f
--- /dev/null
+++ b/tests/Resources/jshrink/input/utf_chars.js
@@ -0,0 +1,11 @@
+var π = Math.PI,
+    ε = 1e-6,
+    radians = π / 180,
+    degrees = 180 / π;
+
+function sgn(x) {
+
+
+    var π = Math.PI;
+    return x > 0 ? 1 : x < 0 ? -1 : 0;
+}
\ No newline at end of file
diff --git a/tests/Resources/jshrink/output/utf_chars.js b/tests/Resources/jshrink/output/utf_chars.js
new file mode 100644
index 0000000..7efc0e8
--- /dev/null
+++ b/tests/Resources/jshrink/output/utf_chars.js
@@ -0,0 +1 @@
+var π=Math.PI,ε=1e-6,radians=π/ 180,degrees=180 / π;function sgn(x){var π=Math.PI;return x>0?1:x<0?-1:0;}
\ No newline at end of file