diff --git a/picard/webservice/ratecontrol.py b/picard/webservice/ratecontrol.py
index 2544a894f1..51b7042086 100644
--- a/picard/webservice/ratecontrol.py
+++ b/picard/webservice/ratecontrol.py
@@ -6,7 +6,7 @@
 # Copyright (C) 2009 Carlin Mangar
 # Copyright (C) 2017 Sambhav Kothari
 # Copyright (C) 2018, 2020-2021, 2023-2024 Laurent Monin
-# Copyright (C) 2019, 2022 Philipp Wolfer
+# Copyright (C) 2019, 2022, 2024 Philipp Wolfer
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU General Public License
@@ -83,7 +83,7 @@ def set_minimum_delay(hostkey, delay_ms):
             hostkey is an unique key, for example (host, port)
             delay_ms is the delay in milliseconds
     """
-    REQUEST_DELAY_MINIMUM[hostkey] = delay_ms
+    REQUEST_DELAY_MINIMUM[hostkey] = int(delay_ms)
 
 
 def set_minimum_delay_for_url(url, delay_ms):
diff --git a/test/test_ratecontrol.py b/test/test_ratecontrol.py
new file mode 100644
index 0000000000..d185c853e4
--- /dev/null
+++ b/test/test_ratecontrol.py
@@ -0,0 +1,47 @@
+# -*- coding: utf-8 -*-
+#
+# Picard, the next-generation MusicBrainz tagger
+#
+# Copyright (C) 2024 Philipp Wolfer
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+from collections import defaultdict
+
+from test.picardtestcase import PicardTestCase
+
+from picard.webservice import ratecontrol
+
+
+class RateControlTest(PicardTestCase):
+
+    def setUp(self):
+        super().setUp()
+        ratecontrol.REQUEST_DELAY_MINIMUM = defaultdict(lambda: 1000)
+
+    def test_set_minimum_delay(self):
+        hostkey = ('example.com', 80)
+        ratecontrol.set_minimum_delay(hostkey, 200)
+        self.assertEqual(200, ratecontrol.REQUEST_DELAY_MINIMUM[hostkey])
+
+    def test_set_minimum_delay_with_float(self):
+        hostkey = ('example.com', 80)
+        ratecontrol.set_minimum_delay(hostkey, 33.8)
+        self.assertEqual(33, ratecontrol.REQUEST_DELAY_MINIMUM[hostkey])
+
+    def test_set_minimum_delay_for_url(self):
+        hostkey = ('example.com', 443)
+        ratecontrol.set_minimum_delay_for_url('https://example.com', 300)
+        self.assertEqual(300, ratecontrol.REQUEST_DELAY_MINIMUM[hostkey])