diff --git a/moto/secretsmanager/models.py b/moto/secretsmanager/models.py
index 7040d4136..6ecc32935 100644
--- a/moto/secretsmanager/models.py
+++ b/moto/secretsmanager/models.py
@@ -47,7 +47,7 @@ class SecretsManagerBackend(BaseBackend):
     def get_secret_value(self, secret_id, version_id, version_stage):
 
         if not self._is_valid_identifier(secret_id):
-            raise ResourceNotFoundException("Secrets Manager can’t find the specified secret.")
+            raise ResourceNotFoundException(u"Secrets Manager can’t find the specified secret.")
 
         if not version_id and version_stage:
             # set version_id to match version_stage
@@ -57,7 +57,7 @@ class SecretsManagerBackend(BaseBackend):
                     version_id = ver_id
                     break
             if not version_id:
-                raise ResourceNotFoundException("Secrets Manager can’t find the specified secret.")
+                raise ResourceNotFoundException(u"Secrets Manager can’t find the specified secret.")
 
         # TODO check this part
         if 'deleted_date' in self.secrets[secret_id]:
@@ -87,8 +87,8 @@ class SecretsManagerBackend(BaseBackend):
 
         if 'secret_string' not in secret_version and 'secret_binary' not in secret_version:
             raise ResourceNotFoundException(
-                "Secrets Manager can’t find the specified secret value for staging label: %s" %
-                (version_stage or "AWSCURRENT")
+                u"Secrets Manager can’t find the specified secret value for staging label: %s" %
+                (version_stage or u"AWSCURRENT")
             )
 
         response = json.dumps(response_data)
@@ -176,7 +176,7 @@ class SecretsManagerBackend(BaseBackend):
 
     def describe_secret(self, secret_id):
         if not self._is_valid_identifier(secret_id):
-            raise ResourceNotFoundException("Secrets Manager can’t find the specified secret.")
+            raise ResourceNotFoundException(u"Secrets Manager can’t find the specified secret.")
 
         secret = self.secrets[secret_id]
 
@@ -205,7 +205,7 @@ class SecretsManagerBackend(BaseBackend):
         rotation_days = 'AutomaticallyAfterDays'
 
         if not self._is_valid_identifier(secret_id):
-            raise ResourceNotFoundException("Secrets Manager can’t find the specified secret.")
+            raise ResourceNotFoundException(u"Secrets Manager can’t find the specified secret.")
 
         if 'deleted_date' in self.secrets[secret_id]:
             raise InvalidRequestException(
@@ -347,7 +347,7 @@ class SecretsManagerBackend(BaseBackend):
     def delete_secret(self, secret_id, recovery_window_in_days, force_delete_without_recovery):
 
         if not self._is_valid_identifier(secret_id):
-            raise ResourceNotFoundException("Secrets Manager can’t find the specified secret.")
+            raise ResourceNotFoundException(u"Secrets Manager can’t find the specified secret.")
 
         if 'deleted_date' in self.secrets[secret_id]:
             raise InvalidRequestException(
@@ -377,7 +377,7 @@ class SecretsManagerBackend(BaseBackend):
             secret = self.secrets.get(secret_id, None)
 
         if not secret:
-            raise ResourceNotFoundException("Secrets Manager can’t find the specified secret.")
+            raise ResourceNotFoundException(u"Secrets Manager can’t find the specified secret.")
 
         arn = secret_arn(self.region, secret['secret_id'])
         name = secret['name']
@@ -387,7 +387,7 @@ class SecretsManagerBackend(BaseBackend):
     def restore_secret(self, secret_id):
 
         if not self._is_valid_identifier(secret_id):
-            raise ResourceNotFoundException("Secrets Manager can’t find the specified secret.")
+            raise ResourceNotFoundException(u"Secrets Manager can’t find the specified secret.")
 
         self.secrets[secret_id].pop('deleted_date', None)
 
diff --git a/tests/test_secretsmanager/test_server.py b/tests/test_secretsmanager/test_server.py
index bc8b9700d..552ed6a92 100644
--- a/tests/test_secretsmanager/test_server.py
+++ b/tests/test_secretsmanager/test_server.py
@@ -50,7 +50,7 @@ def test_get_secret_that_does_not_exist():
                                "X-Amz-Target": "secretsmanager.GetSecretValue"},
                            )
     json_data = json.loads(get_secret.data.decode("utf-8"))
-    assert json_data['message'] == "Secrets Manager can’t find the specified secret."
+    assert json_data['message'] == u"Secrets Manager can’t find the specified secret."
     assert json_data['__type'] == 'ResourceNotFoundException'
 
 @mock_secretsmanager
@@ -71,7 +71,7 @@ def test_get_secret_that_does_not_match():
                                "X-Amz-Target": "secretsmanager.GetSecretValue"},
                            )
     json_data = json.loads(get_secret.data.decode("utf-8"))
-    assert json_data['message'] == "Secrets Manager can’t find the specified secret."
+    assert json_data['message'] == u"Secrets Manager can’t find the specified secret."
     assert json_data['__type'] == 'ResourceNotFoundException'
 
 @mock_secretsmanager
@@ -91,7 +91,7 @@ def test_get_secret_that_has_no_value():
                            )
 
     json_data = json.loads(get_secret.data.decode("utf-8"))
-    assert json_data['message'] == "Secrets Manager can’t find the specified secret value for staging label: AWSCURRENT"
+    assert json_data['message'] == u"Secrets Manager can’t find the specified secret value for staging label: AWSCURRENT"
     assert json_data['__type'] == 'ResourceNotFoundException'
 
 @mock_secretsmanager
@@ -179,7 +179,7 @@ def test_describe_secret_that_does_not_exist():
                     )
 
     json_data = json.loads(describe_secret.data.decode("utf-8"))
-    assert json_data['message'] == "Secrets Manager can’t find the specified secret."
+    assert json_data['message'] == u"Secrets Manager can’t find the specified secret."
     assert json_data['__type'] == 'ResourceNotFoundException'
 
 @mock_secretsmanager
@@ -203,7 +203,7 @@ def test_describe_secret_that_does_not_match():
                     )
 
     json_data = json.loads(describe_secret.data.decode("utf-8"))
-    assert json_data['message'] == "Secrets Manager can’t find the specified secret."
+    assert json_data['message'] == u"Secrets Manager can’t find the specified secret."
     assert json_data['__type'] == 'ResourceNotFoundException'
 
 @mock_secretsmanager
@@ -304,7 +304,7 @@ def test_rotate_secret_that_does_not_exist():
                     )
 
     json_data = json.loads(rotate_secret.data.decode("utf-8"))
-    assert json_data['message'] == "Secrets Manager can’t find the specified secret."
+    assert json_data['message'] == u"Secrets Manager can’t find the specified secret."
     assert json_data['__type'] == 'ResourceNotFoundException'
 
 @mock_secretsmanager
@@ -328,7 +328,7 @@ def test_rotate_secret_that_does_not_match():
                     )
 
     json_data = json.loads(rotate_secret.data.decode("utf-8"))
-    assert json_data['message'] == "Secrets Manager can’t find the specified secret."
+    assert json_data['message'] == u"Secrets Manager can’t find the specified secret."
     assert json_data['__type'] == 'ResourceNotFoundException'
 
 @mock_secretsmanager