diff --git a/types/rsvp/index.d.ts b/types/rsvp/index.d.ts
index 4e9b8edda9..e32ad96363 100755
--- a/types/rsvp/index.d.ts
+++ b/types/rsvp/index.d.ts
@@ -122,6 +122,8 @@ declare module 'rsvp' {
 
             finally<U>(onFinally?: U | PromiseLike<U>): RSVP.Promise<T>;
 
+            readonly [Symbol.toStringTag]: "Promise";
+
             static all<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(
                 values: [
                     Arg<T1>,
diff --git a/types/rsvp/rsvp-tests.ts b/types/rsvp/rsvp-tests.ts
index 7805c40fa5..1f14a3318b 100755
--- a/types/rsvp/rsvp-tests.ts
+++ b/types/rsvp/rsvp-tests.ts
@@ -324,3 +324,7 @@ function testOnAndOff() {
         );
     });
 }
+
+function testAssignableToPromise() {
+    const promise: Promise<number> = RSVP.resolve(0);
+}