diff --git a/modules/jquery.wikiEditor.dialogs.less b/modules/jquery.wikiEditor.dialogs.less
index c01db72c..18aa9ecd 100644
--- a/modules/jquery.wikiEditor.dialogs.less
+++ b/modules/jquery.wikiEditor.dialogs.less
@@ -15,7 +15,7 @@
 		/* stylelint-enable declaration-no-important */
 
 		input[ type='text' ] {
-			.box-sizing( border-box );
+			box-sizing: border-box;
 		}
 
 		input {
diff --git a/modules/jquery.wikiEditor.toolbar-apex.less b/modules/jquery.wikiEditor.toolbar-apex.less
index 4ade0865..754408bf 100644
--- a/modules/jquery.wikiEditor.toolbar-apex.less
+++ b/modules/jquery.wikiEditor.toolbar-apex.less
@@ -43,7 +43,7 @@
 .tool.oo-ui-buttonElement-frameless.oo-ui-iconElement {
 	border: 1px solid transparent;
 	border-radius: 2px;
-	.transition( ~'border-color 250ms' );
+	transition: border-color 250ms;
 
 	&:hover {
 		border-color: rgba( 0, 0, 0, 0.2 );
@@ -63,7 +63,7 @@
 .tool.oo-ui-buttonElement-frameless.oo-ui-iconElement {
 	> .oo-ui-buttonElement-button {
 		padding: 2px;
-		.box-sizing( content-box );
+		box-sizing: content-box;
 
 		> .oo-ui-iconElement-icon {
 			margin: 0;
diff --git a/modules/jquery.wikiEditor.toolbar-wikimedia.less b/modules/jquery.wikiEditor.toolbar-wikimedia.less
index 621d234d..35dbc44d 100644
--- a/modules/jquery.wikiEditor.toolbar-wikimedia.less
+++ b/modules/jquery.wikiEditor.toolbar-wikimedia.less
@@ -72,7 +72,7 @@
 .tool-button {
 	width: 32px;
 	height: 32px;
-	.transition( ~'background-color 100ms, color 100ms, border-color 100ms, box-shadow 100ms' );
+	transition: background-color 100ms, color 100ms, border-color 100ms, box-shadow 100ms;
 }
 
 .tool-button,
diff --git a/modules/jquery.wikiEditor.toolbar.less b/modules/jquery.wikiEditor.toolbar.less
index 4c8df1ab..0a828c43 100644
--- a/modules/jquery.wikiEditor.toolbar.less
+++ b/modules/jquery.wikiEditor.toolbar.less
@@ -62,14 +62,14 @@
 					left: 0;
 					width: 16px;
 					height: 32px;
-					.transition( ~'transform 100ms' );
+					transition: transform 100ms;
 
 					body.ltr & {
-						.transform( rotate( -90deg ) );
+						transform: rotate( -90deg );
 					}
 
 					body.rtl & {
-						.transform( rotate( 90deg ) );
+						transform: rotate( 90deg );
 					}
 				}
 			}
@@ -89,7 +89,7 @@
 				&:before {
 					body.ltr &,
 					body.rtl & {
-						.transform( rotate( 0 ) );
+						transform: rotate( 0 );
 					}
 				}
 			}
@@ -175,7 +175,7 @@
 			}
 
 			&.options-shown .label:after {
-				.transform( rotate( 180deg ) );
+				transform: rotate( 180deg );
 			}
 
 			.options {