diff --git a/phpBB/adm/style/acp_permission_roles.html b/phpBB/adm/style/acp_permission_roles.html
index b0364f04f1..37a8fc37c2 100644
--- a/phpBB/adm/style/acp_permission_roles.html
+++ b/phpBB/adm/style/acp_permission_roles.html
@@ -93,10 +93,10 @@
 				<div class="tablewrap">
 					<table id="table00{auth.S_ROW_COUNT}" cellspacing="1">
 					<colgroup>
-						<col class="permissions_name" />
-						<col class="permissions_yes" />
-						<col class="permissions_no" />
-						<col class="permissions_never" />
+						<col class="permissions-name" />
+						<col class="permissions-yes" />
+						<col class="permissions-no" />
+						<col class="permissions-never" />
 					</colgroup>
 					<thead>
 					<tr>
diff --git a/phpBB/adm/style/admin.css b/phpBB/adm/style/admin.css
index 4ed89e645a..283e7086f1 100644
--- a/phpBB/adm/style/admin.css
+++ b/phpBB/adm/style/admin.css
@@ -1316,13 +1316,13 @@ fieldset.permissions .permissions-switch {
 	text-align: right;
 }
 
-.permissions-panel th.permission-name {
+.permissions-panel th.permissions-name {
 	border: none;
 	color: #536482;
 	font-weight: normal;
 }
 
-.permissions-panel th.permission-name a.trace {
+.permissions-panel th.permissions-name a.trace {
 	display: inline;
 }
 
diff --git a/phpBB/adm/style/permission_mask.html b/phpBB/adm/style/permission_mask.html
index 6e9954312f..c1f77bd3cc 100644
--- a/phpBB/adm/style/permission_mask.html
+++ b/phpBB/adm/style/permission_mask.html
@@ -75,11 +75,11 @@
 			<div class="tablewrap">
 				<table id="table{p_mask.S_ROW_COUNT}{p_mask.f_mask.S_ROW_COUNT}{p_mask.f_mask.category.S_ROW_COUNT}" cellspacing="1">
 				<colgroup>
-					<col class="permissions_name" />
-					<col class="permissions_yes" />
-					<col class="permissions_no" />
+					<col class="permissions-name" />
+					<col class="permissions-yes" />
+					<col class="permissions-no" />
 					<!-- IF not p_mask.S_VIEW -->
-						<col class="permissions_never" />
+						<col class="permissions-never" />
 					<!-- ENDIF -->
 				</colgroup>
 				<thead>