diff --git a/extensions/typescript-language-features/src/features/completions.ts b/extensions/typescript-language-features/src/features/completions.ts
index 6758b85b0f6..594687ab97f 100644
--- a/extensions/typescript-language-features/src/features/completions.ts
+++ b/extensions/typescript-language-features/src/features/completions.ts
@@ -97,7 +97,7 @@ class MyCompletionItem extends vscode.CompletionItem {
 		}
 
 		if (tsEntry.kindModifiers) {
-			const kindModifiers = new Set(tsEntry.kindModifiers.split(/\s+/g));
+			const kindModifiers = new Set(tsEntry.kindModifiers.split(/,|\s+/g));
 			if (kindModifiers.has(PConst.KindModifiers.optional)) {
 				if (!this.insertText) {
 					this.insertText = this.label;