diff --git a/add-missing-includes.patch b/add-missing-includes.patch
new file mode 100644
index 0000000..241dfda
--- /dev/null
+++ b/add-missing-includes.patch
@@ -0,0 +1,12 @@
+Index: ITK-5.3.0/Modules/Filtering/MathematicalMorphology/include/itkMathematicalMorphologyEnums.h
+===================================================================
+--- ITK-5.3.0.orig/Modules/Filtering/MathematicalMorphology/include/itkMathematicalMorphologyEnums.h
++++ ITK-5.3.0/Modules/Filtering/MathematicalMorphology/include/itkMathematicalMorphologyEnums.h
+@@ -20,6 +20,7 @@
+ 
+ #include <iostream>
+ #include "ITKMathematicalMorphologyExport.h"
++#include <cstdint>
+ 
+ 
+ namespace itk
diff --git a/insighttoolkit.changes b/insighttoolkit.changes
index 82b8cc7..313e649 100644
--- a/insighttoolkit.changes
+++ b/insighttoolkit.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Apr 10 21:28:42 UTC 2023 - Bjørn Lie <bjorn.lie@gmail.com>
+
+- Add add-missing-includes.patch: Add missing #include <cstdint>.
+  Now exposed by gcc 13.
+
 -------------------------------------------------------------------
 Wed Jan 25 14:04:22 UTC 2023 - Thorsten Kukuk <kukuk@suse.com>
 
diff --git a/insighttoolkit.spec b/insighttoolkit.spec
index 401b9a4..1456d7c 100644
--- a/insighttoolkit.spec
+++ b/insighttoolkit.spec
@@ -43,6 +43,9 @@ Summary:        Toolkit for scientific image processing, segmentation, and regis
 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
+
 BuildRequires:  CastXML-devel
 BuildRequires:  bison
 BuildRequires:  cmake