diff --git a/python-pyserial.changes b/python-pyserial.changes
index ad74806..9822a00 100644
--- a/python-pyserial.changes
+++ b/python-pyserial.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Tue Sep 24 11:27:17 UTC 2024 - ecsos <ecsos@opensuse.org>
+
+- Fix build error under Leap.
+
 -------------------------------------------------------------------
 Mon Jul 29 15:07:43 UTC 2024 - John Paul Adrian Glaubitz <adrian.glaubitz@suse.com>
 
diff --git a/python-pyserial.spec b/python-pyserial.spec
index 6674fbe..bac09cb 100644
--- a/python-pyserial.spec
+++ b/python-pyserial.spec
@@ -26,13 +26,13 @@ Group:          Development/Languages/Python
 URL:            https://github.com/pyserial/pyserial
 Source:         https://files.pythonhosted.org/packages/source/p/pyserial/pyserial-%{version}.tar.gz
 # PATCH-FIX-UPSTREAM - pyserial/pyserial#757 - Replace deprecated unittest.findTestCases function
-Patch:          https://github.com/pyserial/pyserial/pull/757.patch#/replace-deprecated-unittest-function.patch
+Patch1:         https://github.com/pyserial/pyserial/pull/757.patch#/replace-deprecated-unittest-function.patch
 BuildRequires:  %{python_module setuptools}
 BuildRequires:  fdupes
 BuildRequires:  python-rpm-macros
 BuildRequires:  python3-Sphinx
 Requires(post): update-alternatives
-Requires(preun): update-alternatives
+Requires(preun):update-alternatives
 Provides:       python-serial = %{version}
 Obsoletes:      python-serial < %{version}
 BuildArch:      noarch
@@ -54,7 +54,7 @@ Documentation, examples, and help files for %{name}.
 
 %prep
 %setup -q -n pyserial-%{version}
-%patch -P0 -p1
+%patch -P 1 -p1
 
 # Unnecessary
 rm serial/tools/list_ports_windows.py \