diff --git a/insighttoolkit.changes b/insighttoolkit.changes
index 313e649..628ab29 100644
--- a/insighttoolkit.changes
+++ b/insighttoolkit.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Nov  6 16:15:38 UTC 2023 - Dominique Leuenberger <dimstar@opensuse.org>
+
+- Fix build with RPM 4.19: unnumbered patches are no longer
+  supported.
+
 -------------------------------------------------------------------
 Mon Apr 10 21:28:42 UTC 2023 - Bjørn Lie <bjorn.lie@gmail.com>
 
diff --git a/insighttoolkit.spec b/insighttoolkit.spec
index 1456d7c..e8a62e2 100644
--- a/insighttoolkit.spec
+++ b/insighttoolkit.spec
@@ -44,7 +44,7 @@ License:        Apache-2.0
 URL:            https://www.itk.org
 Source:         https://github.com/InsightSoftwareConsortium/ITK/archive/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 # PATCH-FIX-UPSTREAM add-missing-includes.patch -- Add missing #include <cstdint>
-Patch:          add-missing-includes.patch
+Patch0:         add-missing-includes.patch
 
 BuildRequires:  CastXML-devel
 BuildRequires:  bison