diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 446f426e6d3..a7ebc36c7f3 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -10359,6 +10359,8 @@ namespace ts {
             if (returnTag && returnTag.typeExpression) {
                 return getTypeFromTypeNode(returnTag.typeExpression.type);
             }
+            
+            return undefined;
         }
 
         function createPromiseType(promisedType: Type): Type {