diff --git a/adminer/include/design.inc.php b/adminer/include/design.inc.php
index b646d0c7..3ec43467 100644
--- a/adminer/include/design.inc.php
+++ b/adminer/include/design.inc.php
@@ -91,7 +91,7 @@ function page_headers() {
 	header("X-XSS-Protection: 0"); // prevents introducing XSS in IE8 by removing safe parts of the page
 	header("X-Content-Type-Options: nosniff");
 	header("Referrer-Policy: origin-when-cross-origin");
-	header("Content-Security-Policy: default-src 'none'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; connect-src 'self'; img-src 'self'; frame-src https://www.adminer.org; form-action 'self'");
+	header("Content-Security-Policy: default-src 'none'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; connect-src 'self'; img-src 'self' data:; frame-src https://www.adminer.org; form-action 'self'");
 	$adminer->headers();
 }