diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 14b4506baa8..94b35a36b4c 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -15084,14 +15084,14 @@ namespace ts {
             const promiseType = createPromiseType(promisedType);
             if (promiseType === emptyObjectType) {
                 error(func, isImportCallExpression(func) ? 
-                    Diagnostics.An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option :
-                    Diagnostics.A_dynamic_import_call_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option);
+                    Diagnostics.A_dynamic_import_call_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option :
+                    Diagnostics.An_async_function_or_method_must_return_a_Promise_Make_sure_you_have_a_declaration_for_Promise_or_include_ES2015_in_your_lib_option);
                 return unknownType;
             }
             else if (!getGlobalPromiseConstructorSymbol(/*reportErrors*/ true)) {
                 error(func, isImportCallExpression(func) ?
-                    Diagnostics.An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option :
-                    Diagnostics.A_dynamic_import_call_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option);
+                    Diagnostics.A_dynamic_import_call_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option :
+                    Diagnostics.An_async_function_or_method_in_ES5_SlashES3_requires_the_Promise_constructor_Make_sure_you_have_a_declaration_for_the_Promise_constructor_or_include_ES2015_in_your_lib_option);                    
             }
 
             return promiseType;