diff --git a/src/deprecatedCompat/deprecations.ts b/src/deprecatedCompat/deprecations.ts
index 292840166b36f..faaca11844a9b 100644
--- a/src/deprecatedCompat/deprecations.ts
+++ b/src/deprecatedCompat/deprecations.ts
@@ -1092,7 +1092,7 @@ namespace ts {
         }
         return factory.createYieldExpression(asteriskToken, expression);
     } as {
-        (expression?: Expression): YieldExpression;
+        (expression?: Expression | undefined): YieldExpression;
         (asteriskToken: AsteriskToken | undefined, expression: Expression): YieldExpression;
     }, factoryDeprecation);