diff --git a/src/services/completions.ts b/src/services/completions.ts
index 48e1c28bf01de..eb2933f3682ae 100644
--- a/src/services/completions.ts
+++ b/src/services/completions.ts
@@ -1171,7 +1171,7 @@ namespace ts.Completions {
                         /*modifiers*/ undefined,
                         typedParam.dotDotDotToken,
                         typedParam.name,
-                        typedParam.questionToken,
+                        /*questionToken*/ undefined,
                         /*type*/ undefined,
                         typedParam.initializer,
                     ));
diff --git a/tests/cases/fourslash/completionsObjectLiteralMethod5.ts b/tests/cases/fourslash/completionsObjectLiteralMethod5.ts
new file mode 100644
index 0000000000000..7e87be7bba47d
--- /dev/null
+++ b/tests/cases/fourslash/completionsObjectLiteralMethod5.ts
@@ -0,0 +1,38 @@
+/// <reference path="fourslash.ts" />
+
+// @newline: LF
+// @Filename: a.ts
+////interface Foo {
+////    method(x?: string): void;
+////}
+////const foo: Foo = {
+////    /*m*/
+////}
+
+verify.completions({
+    marker: "m",
+    preferences: {
+        includeCompletionsWithInsertText: true,
+        includeCompletionsWithSnippetText: true,
+        includeCompletionsWithObjectLiteralMethodSnippets: true,
+        useLabelDetailsInCompletionEntries: true,
+    },
+    includes: [
+        {
+            name: "method",
+            sortText: completion.SortText.ObjectLiteralProperty(completion.SortText.LocationPriority, "method"),
+            insertText: undefined,
+        },
+        {
+            name: "method",
+            sortText: completion.SortText.SortBelow(
+                completion.SortText.ObjectLiteralProperty(completion.SortText.LocationPriority, "method")),
+            source: completion.CompletionSource.ObjectLiteralMethodSnippet,
+            isSnippet: true,
+            insertText: "method(x) {\n    $0\n},",
+            labelDetails: {
+                detail: "(x)",
+            },
+        },
+    ],
+});