diff --git a/install.php b/install.php
index 1ff2c25f1..6a28a9444 100644
--- a/install.php
+++ b/install.php
@@ -1165,7 +1165,7 @@ class e_install
 
 				}
 
-				$output .= $this->thumbnailSelector('admincss', $opts, 'css/bootstrap-dark.min.css');
+				$output .= $this->thumbnailSelector('admincss', $opts, 'css/modern-dark.css');
 
 				$output .= "