diff --git a/src/vs/base/browser/ui/sash/sash.ts b/src/vs/base/browser/ui/sash/sash.ts
index 7f0a32190c96a2f2a79ab1a2359da795159e36a8..c4159fe0099246f5db1f1a805746c9a324d27a78 100644
--- a/src/vs/base/browser/ui/sash/sash.ts
+++ b/src/vs/base/browser/ui/sash/sash.ts
@@ -125,7 +125,7 @@ export class Sash extends EventEmitter {
 		this.emit('start', startEvent);
 
 		let $window = $(window);
-		let containerCssClass = `${this.getOrientation()}-cursor-container${isMacintosh ? '-mac' : ''}`;
+		let containerCSSClass = `${this.getOrientation()}-cursor-container${isMacintosh ? '-mac' : ''}`;
 
 		let lastCurrentX = startX;
 		let lastCurrentY = startY;
@@ -151,12 +151,12 @@ export class Sash extends EventEmitter {
 			this.emit('end');
 
 			$window.off('mousemove');
-			document.body.classList.remove(containerCssClass);
+			document.body.classList.remove(containerCSSClass);
 
 			$(DOM.getElementsByTagName('iframe')).style('pointer-events', 'auto');
 		});
 
-		document.body.classList.add(containerCssClass);
+		document.body.classList.add(containerCSSClass);
 	}
 
 	private onTouchStart(event: GestureEvent): void {
diff --git a/src/vs/workbench/browser/parts/compositePart.ts b/src/vs/workbench/browser/parts/compositePart.ts
index 47485b404a33d0c34639abcc268f8d0edd9a03f9..5105befa9f661499696bb3897adefb7e2cef8ddc 100644
--- a/src/vs/workbench/browser/parts/compositePart.ts
+++ b/src/vs/workbench/browser/parts/compositePart.ts
@@ -66,7 +66,7 @@ export abstract class CompositePart<T extends Composite> extends Part {
 		private registry: CompositeRegistry<T>,
 		private activeCompositeSettingsKey: string,
 		private nameForTelemetry: string,
-		private compositeCssClass: string,
+		private compositeCSSClass: string,
 		private actionContributionScope: string,
 		id: string
 	) {
@@ -224,7 +224,7 @@ export abstract class CompositePart<T extends Composite> extends Part {
 
 			// Build Container off-DOM
 			compositeContainer = $().div({
-				'class': ['composite', this.compositeCssClass],
+				'class': ['composite', this.compositeCSSClass],
 				id: composite.getId()
 			}, (div: Builder) => {
 				createCompositePromise = composite.create(div);
diff --git a/src/vs/workbench/services/themes/electron-browser/themeService.ts b/src/vs/workbench/services/themes/electron-browser/themeService.ts
index 518e059820a3e758d77581147a969d6e372446b8..e2ee73d6d48444bc219fc3e2275d21753cfb3d9c 100644
--- a/src/vs/workbench/services/themes/electron-browser/themeService.ts
+++ b/src/vs/workbench/services/themes/electron-browser/themeService.ts
@@ -237,7 +237,7 @@ export class ThemeService implements IThemeService {
 				collector.warn(nls.localize('invalid.path.1', "Expected `contributes.{0}.path` ({1}) to be included inside extension's folder ({2}). This might make the extension non-portable.", themesExtPoint.name, normalizedAbsolutePath, extensionFolderPath));
 			}
 
-			let themeSelector = toCssSelector(extensionId + '-' + Paths.normalize(theme.path));
+			let themeSelector = toCSSSelector(extensionId + '-' + Paths.normalize(theme.path));
 			this.knownThemes.push({
 				id: `${theme.uiTheme || defaultBaseTheme} ${themeSelector}`,
 				label: theme.label || Paths.basename(theme.path),
@@ -268,7 +268,7 @@ export class ThemeService implements IThemeService {
 
 
 
-function toCssSelector(str: string) {
+function toCSSSelector(str: string) {
 	return str.replace(/[^_\-a-zA-Z0-9]/g, '-');
 }