diff --git a/phpBB/styles/prosilver/theme/content.css b/phpBB/styles/prosilver/theme/content.css
index 92a7db81d9..e7c0e177a6 100644
--- a/phpBB/styles/prosilver/theme/content.css
+++ b/phpBB/styles/prosilver/theme/content.css
@@ -515,7 +515,7 @@ blockquote .codebox {
 	max-height: 200px;
 	white-space: normal;
 	padding-top: 5px;
-	font: 0.9em Monaco, "Andale Mono","Courier New", Courier, mono;
+	font: 0.9em Monaco, "Andale Mono","Courier New", Courier, monospace;
 	line-height: 1.3em;
 	margin: 2px 0;
 }