diff --git a/src/Step/StaticFiles/Copy.php b/src/Step/StaticFiles/Copy.php
index 56e7ecb3d..874d81a03 100644
--- a/src/Step/StaticFiles/Copy.php
+++ b/src/Step/StaticFiles/Copy.php
@@ -72,7 +72,7 @@ public function process(): void
         // copying mounts
         if ($this->config->get('static.mounts')) {
             foreach ($this->config->get('static.mounts') as $source => $destination) {
-                $this->copy($source, $destination);
+                $this->copy(Util::joinFile($this->config->getStaticPath(), (string) $source), (string) $destination);
             }
         }
 
diff --git a/tests/fixtures/website/config.php b/tests/fixtures/website/config.php
index 4a7d563aa..99e68c984 100644
--- a/tests/fixtures/website/config.php
+++ b/tests/fixtures/website/config.php
@@ -176,6 +176,9 @@
             'path',
         ],
         'load' => true,
+        'mounts' => [
+            'video' => 'mount_test',
+        ],
     ],
     'assets' => [
         'compile' => [