diff --git a/phpBB/styles/prosilver/theme/content.css b/phpBB/styles/prosilver/theme/content.css
index d23632e412..d1d20d4a99 100644
--- a/phpBB/styles/prosilver/theme/content.css
+++ b/phpBB/styles/prosilver/theme/content.css
@@ -553,6 +553,7 @@ blockquote .codebox {
 	clear: left;
 	border-top: 1px solid transparent;
 	overflow-x: auto;
+	overflow-y: hidden;
 }
 
 .attachbox dd dd {