diff --git a/moto/secretsmanager/utils.py b/moto/secretsmanager/utils.py
index 24d1a8549..b9a7671b3 100644
--- a/moto/secretsmanager/utils.py
+++ b/moto/secretsmanager/utils.py
@@ -64,7 +64,7 @@ def random_password(
 
 
 def secret_arn(region, secret_id):
-    id_string = "".join(random.choice(string.ascii_letters) for _ in range(5))
+    id_string = "".join(random.choice(string.ascii_letters) for _ in range(6))
     return "arn:aws:secretsmanager:{0}:{1}:secret:{2}-{3}".format(
         region, get_account_id(), secret_id, id_string
     )
diff --git a/tests/test_secretsmanager/test_secretsmanager.py b/tests/test_secretsmanager/test_secretsmanager.py
index ec793cb7b..7568805a4 100644
--- a/tests/test_secretsmanager/test_secretsmanager.py
+++ b/tests/test_secretsmanager/test_secretsmanager.py
@@ -2,6 +2,7 @@ import os
 
 import boto3
 from dateutil.tz import tzlocal
+import re
 
 from moto import mock_secretsmanager, mock_lambda, settings
 from moto.core import ACCOUNT_ID
@@ -26,6 +27,22 @@ def test_get_secret_value():
     assert result["SecretString"] == "foosecret"
 
 
+@mock_secretsmanager
+def test_secret_arn():
+    region = "us-west-2"
+    conn = boto3.client("secretsmanager", region_name=region)
+
+    create_dict = conn.create_secret(
+        Name=DEFAULT_SECRET_NAME,
+        SecretString="secret_string",
+    )
+    assert re.match(
+        f"arn:aws:secretsmanager:{region}:{ACCOUNT_ID}:secret:{DEFAULT_SECRET_NAME}-"
+        + r"\w{6}",
+        create_dict["ARN"],
+    )
+
+
 @mock_secretsmanager
 def test_create_secret_with_client_request_token():
     conn = boto3.client("secretsmanager", region_name="us-west-2")