diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 43b91551a29..389fed35916 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -10347,6 +10347,8 @@ namespace ts {
             if (returnTag && returnTag.typeExpression) {
                 return getTypeFromTypeNode(returnTag.typeExpression.type);
             }
+            
+            return undefined;
         }
 
         function createPromiseType(promisedType: Type): Type {