diff --git a/ts/test/session/unit/crypto/MessageEncrypter_test.ts b/ts/test/session/unit/crypto/MessageEncrypter_test.ts
index eb85516e2..fc130eab7 100644
--- a/ts/test/session/unit/crypto/MessageEncrypter_test.ts
+++ b/ts/test/session/unit/crypto/MessageEncrypter_test.ts
@@ -12,7 +12,7 @@ import * as Ratchet from '../../../../session/medium_group/ratchet';
 // tslint:disable-next-line: max-func-body-length
 describe('MessageEncrypter', () => {
   const sandbox = sinon.createSandbox();
-  const ourNumber = 'ourNumber';
+  const ourNumber = '0123456789abcdef';
 
   beforeEach(() => {
     TestUtils.stubWindow('libsignal', {
diff --git a/ts/test/session/unit/sending/MessageSender_test.ts b/ts/test/session/unit/sending/MessageSender_test.ts
index 1b1411572..66ea30d39 100644
--- a/ts/test/session/unit/sending/MessageSender_test.ts
+++ b/ts/test/session/unit/sending/MessageSender_test.ts
@@ -36,7 +36,7 @@ describe('MessageSender', () => {
   });
 
   describe('send', () => {
-    const ourNumber = 'ourNumber';
+    const ourNumber = '0123456789abcdef';
     let lokiMessageAPISendStub: sinon.SinonStub<
       [string, Uint8Array, number, number],
       Promise<void>