diff --git a/src/services/services.ts b/src/services/services.ts
index 5142b19b6c0..529ce8a7bf7 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -1267,7 +1267,7 @@ namespace ts {
         InsertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: boolean;
         InsertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: boolean;
         InsertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: boolean;
-        InsertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces: boolean;
+        InsertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces?: boolean;
         PlaceOpenBraceOnNewLineForFunctions: boolean;
         PlaceOpenBraceOnNewLineForControlBlocks: boolean;
         [s: string]: boolean | number | string | undefined;