diff --git a/src/vs/editor/browser/services/codeEditorServiceImpl.ts b/src/vs/editor/browser/services/codeEditorServiceImpl.ts
index 3e03681e22b56c7db5e78d45ca8e85925da6527a..7ddea523070acdabc6a581cd8efa3ccd680db4eb 100644
--- a/src/vs/editor/browser/services/codeEditorServiceImpl.ts
+++ b/src/vs/editor/browser/services/codeEditorServiceImpl.ts
@@ -141,18 +141,18 @@ class DecorationTypeOptionsProvider implements IModelDecorationOptionsProvider {
 		this.refCount = 0;
 		this._disposables = [];
 
-		let createCSSRules = (type: ModelDecorationCSSRuleType) => {
-			let rules = new DecorationCSSRules(type, providerArgs, themeService);
+		const createCSSRules = (type: ModelDecorationCSSRuleType) => {
+			const rules = new DecorationCSSRules(type, providerArgs, themeService);
+			this._disposables.push(rules);
 			if (rules.hasContent) {
-				this._disposables.push(rules);
 				return rules.className;
 			}
 			return void 0;
 		};
-		let createInlineCSSRules = (type: ModelDecorationCSSRuleType) => {
-			let rules = new DecorationCSSRules(type, providerArgs, themeService);
+		const createInlineCSSRules = (type: ModelDecorationCSSRuleType) => {
+			const rules = new DecorationCSSRules(type, providerArgs, themeService);
+			this._disposables.push(rules);
 			if (rules.hasContent) {
-				this._disposables.push(rules);
 				return { className: rules.className, hasLetterSpacing: rules.hasLetterSpacing };
 			}
 			return null;