diff --git a/connexion/apps/flask.py b/connexion/apps/flask.py
index 1bb1e229b..a584c344b 100644
--- a/connexion/apps/flask.py
+++ b/connexion/apps/flask.py
@@ -79,7 +79,7 @@ def _set_base_path(self, base_path: t.Optional[str] = None) -> None:
         self._set_blueprint()
 
     def _set_blueprint(self):
-        endpoint = flask_utils.flaskify_endpoint(self.base_path)
+        endpoint = flask_utils.flaskify_endpoint(self.base_path) or "/"
         self.blueprint = flask.Blueprint(
             endpoint,
             __name__,
diff --git a/tests/test_api.py b/tests/test_api.py
index 998f8ee71..4c9a40887 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -39,7 +39,7 @@ def test_api():
 
 def test_api_base_path_slash():
     api = FlaskApi(TEST_FOLDER / "fixtures/simple/basepath-slash.yaml")
-    assert api.blueprint.name == ""
+    assert api.blueprint.name == "/"
     assert api.blueprint.url_prefix == ""