diff --git a/phpBB/styles/prosilver/theme/buttons.css b/phpBB/styles/prosilver/theme/buttons.css
index 55ecb53d05..7d98aeda65 100644
--- a/phpBB/styles/prosilver/theme/buttons.css
+++ b/phpBB/styles/prosilver/theme/buttons.css
@@ -7,7 +7,7 @@
 .button {
 	font-family: "Open Sans", "Droid Sans", Verdana, Arial, Helvetica;
 	font-size: 13px;
-	font-weight: normal;
+	font-weight: 600;
 	line-height: 1.4;
 	text-align: center;
 	vertical-align: middle;