diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6ee2221..59de8b5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ Released: -
 ```
 * [Changed] Improve documentation
 * [Fixed] Improve hostname detection with proxies
+* [Fixed] Fix detection of Windows-based server environments
 ```
 
 ### Version 1.0.4
diff --git a/lib/Pico.php b/lib/Pico.php
index bbb4131..e40f8e2 100644
--- a/lib/Pico.php
+++ b/lib/Pico.php
@@ -1371,7 +1371,7 @@ class Pico
      */
     public function getAbsolutePath($path)
     {
-        if (strncasecmp(PHP_OS, 'WIN', 3) === 0) {
+        if (DIRECTORY_SEPARATOR === '\\') {
             if (preg_match('/^([a-zA-Z]:\\\\|\\\\\\\\)/', $path) !== 1) {
                 $path = $this->getRootDir() . $path;
             }