diff --git a/CHANGES.rst b/CHANGES.rst
index 175f9e87..382653c6 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -27,6 +27,8 @@ Unreleased
 
 -   Work around an issue when running the ``flask`` command with an
     external debugger on Windows. :issue:`3297`
+-   The static route will not catch all URLs if the ``Flask``
+    ``static_folder`` argument ends with a slash. :issue:`3452`
 
 
 Version 1.1.1
diff --git a/src/flask/helpers.py b/src/flask/helpers.py
index e3e59248..ef344d7a 100644
--- a/src/flask/helpers.py
+++ b/src/flask/helpers.py
@@ -1012,6 +1012,8 @@ class _PackageBoundObject(object):
 
     @static_folder.setter
     def static_folder(self, value):
+        if value is not None:
+            value = value.rstrip("/\\")
         self._static_folder = value
 
     @property
diff --git a/tests/test_basic.py b/tests/test_basic.py
index f2e3ca96..2328a82c 100644
--- a/tests/test_basic.py
+++ b/tests/test_basic.py
@@ -1426,6 +1426,17 @@ def test_static_url_empty_path_default(app):
     rv.close()
 
 
+def test_static_folder_with_ending_slash():
+    app = flask.Flask(__name__, static_folder="static/")
+
+    @app.route("/<path:path>")
+    def catch_all(path):
+        return path
+
+    rv = app.test_client().get("/catch/all")
+    assert rv.data == b"catch/all"
+
+
 def test_static_route_with_host_matching():
     app = flask.Flask(__name__, host_matching=True, static_host="example.com")
     c = app.test_client()