diff --git a/ext/admin/main.php b/ext/admin/main.php
index 25187267..9fe0efe8 100644
--- a/ext/admin/main.php
+++ b/ext/admin/main.php
@@ -17,7 +17,7 @@
  *  <br>Download the contents of the database in plain text format, useful
  *  for backups.
  *  <p>Image dump:
- *  <br>Download all the images as a .zip file
+ *  <br>Download all the images as a .zip file (Requires ZipArchive)
  */
 
 /**
diff --git a/ext/admin/theme.php b/ext/admin/theme.php
index 5f1a3c5c..d1090b6f 100644
--- a/ext/admin/theme.php
+++ b/ext/admin/theme.php
@@ -45,7 +45,8 @@ class AdminPageTheme extends Themelet {
 		$html = "";
 		$html .= $this->button("All tags to lowercase", "lowercase_all_tags", true);
 		$html .= $this->button("Recount tag use", "recount_tag_use", false);
-		$html .= $this->button("Download all images", "download_all_images", false);
+		if(class_exists('ZipArchive'))
+			$html .= $this->button("Download all images", "download_all_images", false);
         $html .= $this->button("Download database contents", "database_dump", false);
 		if($database->get_driver_name() == "mysql")
 			$html .= $this->button("Reset image IDs", "reset_image_ids", true);