diff --git a/moto/ec2/exceptions.py b/moto/ec2/exceptions.py
index 4df507a0d..5af4690ae 100644
--- a/moto/ec2/exceptions.py
+++ b/moto/ec2/exceptions.py
@@ -232,12 +232,11 @@ class InvalidVolumeAttachmentError(EC2ClientError):
 
 
 class VolumeInUseError(EC2ClientError):
-
     def __init__(self, volume_id, instance_id):
         super(VolumeInUseError, self).__init__(
             "VolumeInUse",
-            "Volume {0} is currently attached to {1}"
-            .format(volume_id, instance_id))
+            "Volume {0} is currently attached to {1}".format(volume_id, instance_id),
+        )
 
 
 class InvalidDomainError(EC2ClientError):
diff --git a/tests/test_ec2/test_elastic_block_store.py b/tests/test_ec2/test_elastic_block_store.py
index 1182610e8..ac9c7e3d9 100644
--- a/tests/test_ec2/test_elastic_block_store.py
+++ b/tests/test_ec2/test_elastic_block_store.py
@@ -76,7 +76,9 @@ def test_delete_attached_volume():
         volume.delete()
     ex.exception.error_code.should.equal("VolumeInUse")
     ex.exception.status.should.equal(400)
-    ex.exception.message.should.equal(f"Volume {volume.id} is currently attached to {instance.id}")
+    ex.exception.message.should.equal(
+        f"Volume {volume.id} is currently attached to {instance.id}"
+    )
 
     volume.detach()