diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 30530f51ab400..62165bd78f7dd 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -3421,6 +3421,7 @@ namespace ts {
         getWidenedType(type: Type): Type;
         /* @internal */
         getPromisedTypeOfPromise(promise: Type, errorNode?: Node): Type | undefined;
+        /* @internal */
         getAwaitedType(type: Type): Type | undefined;
         getReturnTypeOfSignature(signature: Signature): Type;
         /**
diff --git a/src/services/codefixes/fixReturnTypeInAsyncFunction.ts b/src/services/codefixes/fixReturnTypeInAsyncFunction.ts
index 0c0287beeffc5..39e2c1900f3c7 100644
--- a/src/services/codefixes/fixReturnTypeInAsyncFunction.ts
+++ b/src/services/codefixes/fixReturnTypeInAsyncFunction.ts
@@ -24,7 +24,11 @@ namespace ts.codefix {
             }
             const { returnTypeNode, returnType, promisedTypeNode, promisedType } = info;
             const changes = textChanges.ChangeTracker.with(context, t => doChange(t, sourceFile, returnTypeNode, promisedTypeNode));
-            return [createCodeFixAction(fixId, changes, [Diagnostics.Replace_0_with_Promise_1, checker.typeToString(returnType), checker.typeToString(promisedType)], fixId, Diagnostics.Fix_all_incorrect_return_type_of_an_async_functions)];
+            return [createCodeFixAction(
+                fixId, changes,
+                [Diagnostics.Replace_0_with_Promise_1,
+                 checker.typeToString(returnType), checker.typeToString(promisedType)],
+                fixId, Diagnostics.Fix_all_incorrect_return_type_of_an_async_functions)];
         },
         getAllCodeActions: context => codeFixAll(context, errorCodes, (changes, diag) => {
             const info = getInfo(diag.file, context.program.getTypeChecker(), diag.start);
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index 5ed6e72bb7335..22d6234d13d6b 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -2035,7 +2035,6 @@ declare namespace ts {
         getBaseTypes(type: InterfaceType): BaseType[];
         getBaseTypeOfLiteralType(type: Type): Type;
         getWidenedType(type: Type): Type;
-        getAwaitedType(type: Type): Type | undefined;
         getReturnTypeOfSignature(signature: Signature): Type;
         getNullableType(type: Type, flags: TypeFlags): Type;
         getNonNullableType(type: Type): Type;
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index 5328478fb3dec..4e4746560ed7c 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -2035,7 +2035,6 @@ declare namespace ts {
         getBaseTypes(type: InterfaceType): BaseType[];
         getBaseTypeOfLiteralType(type: Type): Type;
         getWidenedType(type: Type): Type;
-        getAwaitedType(type: Type): Type | undefined;
         getReturnTypeOfSignature(signature: Signature): Type;
         getNullableType(type: Type, flags: TypeFlags): Type;
         getNonNullableType(type: Type): Type;
diff --git a/tests/baselines/reference/asyncArrowFunction_allowJs.errors.txt b/tests/baselines/reference/asyncArrowFunction_allowJs.errors.txt
index e006f1668c13b..2a33da31b95d6 100644
--- a/tests/baselines/reference/asyncArrowFunction_allowJs.errors.txt
+++ b/tests/baselines/reference/asyncArrowFunction_allowJs.errors.txt
@@ -1,7 +1,7 @@
 tests/cases/conformance/async/es2017/asyncArrowFunction/file.js(3,17): error TS2322: Type '0' is not assignable to type 'string'.
-tests/cases/conformance/async/es2017/asyncArrowFunction/file.js(6,24): error TS1064: The return type of an async function or method must be the global Promise<T> type.
+tests/cases/conformance/async/es2017/asyncArrowFunction/file.js(6,24): error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<string>'?
 tests/cases/conformance/async/es2017/asyncArrowFunction/file.js(7,23): error TS2322: Type '0' is not assignable to type 'string'.
-tests/cases/conformance/async/es2017/asyncArrowFunction/file.js(10,24): error TS1064: The return type of an async function or method must be the global Promise<T> type.
+tests/cases/conformance/async/es2017/asyncArrowFunction/file.js(10,24): error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<string>'?
 tests/cases/conformance/async/es2017/asyncArrowFunction/file.js(12,2): error TS2322: Type '0' is not assignable to type 'string'.
 tests/cases/conformance/async/es2017/asyncArrowFunction/file.js(19,3): error TS2345: Argument of type '() => Promise<number>' is not assignable to parameter of type '() => string'.
   Type 'Promise<number>' is not assignable to type 'string'.
@@ -17,7 +17,7 @@ tests/cases/conformance/async/es2017/asyncArrowFunction/file.js(19,3): error TS2
     // Error (good)
     /** @type {function(): string} */
                            ~~~~~~
-!!! error TS1064: The return type of an async function or method must be the global Promise<T> type.
+!!! error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<string>'?
     const b = async () => 0
                           ~
 !!! error TS2322: Type '0' is not assignable to type 'string'.
@@ -25,7 +25,7 @@ tests/cases/conformance/async/es2017/asyncArrowFunction/file.js(19,3): error TS2
     // No error (bad)
     /** @type {function(): string} */
                            ~~~~~~
-!!! error TS1064: The return type of an async function or method must be the global Promise<T> type.
+!!! error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<string>'?
     const c = async () => {
     	return 0
     	~~~~~~~~