diff --git a/system/src/Grav/Common/Page/Medium/ImageMedium.php b/system/src/Grav/Common/Page/Medium/ImageMedium.php
index 85e3d63b6..3db039643 100644
--- a/system/src/Grav/Common/Page/Medium/ImageMedium.php
+++ b/system/src/Grav/Common/Page/Medium/ImageMedium.php
@@ -135,7 +135,7 @@ class ImageMedium extends Medium
      */
     public function url($reset = true)
     {
-        $output = preg_replace('|^' . GRAV_ROOT . '|', '', $this->saveImage());
+        $output = preg_replace('|^' . preg_quote(GRAV_ROOT) . '|', '', $this->saveImage());
 
         if ($reset) {
             $this->reset();
diff --git a/system/src/Grav/Common/Page/Medium/Medium.php b/system/src/Grav/Common/Page/Medium/Medium.php
index a5e4001a7..714eeb5e8 100644
--- a/system/src/Grav/Common/Page/Medium/Medium.php
+++ b/system/src/Grav/Common/Page/Medium/Medium.php
@@ -137,7 +137,7 @@ class Medium extends Data implements RenderableInterface
      */
     public function url($reset = true)
     {
-        $output = preg_replace('|^' . GRAV_ROOT . '|', '', $this->get('filepath'));
+        $output = preg_replace('|^' . preg_quote(GRAV_ROOT) . '|', '', $this->get('filepath'));
 
         if ($reset) {
             $this->reset();