diff --git a/phpBB/styles/prosilver/theme/content.css b/phpBB/styles/prosilver/theme/content.css
index 0db018b312..9b2d67d458 100644
--- a/phpBB/styles/prosilver/theme/content.css
+++ b/phpBB/styles/prosilver/theme/content.css
@@ -600,6 +600,7 @@ blockquote .codebox {
 	border-top: 1px solid transparent;
 	clear: left;
 	overflow-x: auto;
+	overflow-y: hidden;
 	margin-top: 4px;
 	padding-top: 4px;
 }