diff --git a/gcc13_fix.patch b/gcc13_fix.patch
new file mode 100644
index 0000000..e66a166
--- /dev/null
+++ b/gcc13_fix.patch
@@ -0,0 +1,86 @@
+commit a2577f635de569d9ece4dc042c000a1b5a810ac7
+Author: kerkovits <kerkovits@map.elte.hu>
+Date:   Thu Mar 23 21:16:02 2023 +0100
+
+    Fix compile-time errors with GCC 13 https://github.com/GrandOrgue/grandorgue/discussions/1434
+    
+    * Added cstdint where it was neccessary for gcc13.
+    
+    * Document bugfix
+    
+    * Fixed typo and error in BUILD.md
+
+diff --git a/BUILD.md b/BUILD.md
+index 0c449dca..e263bfcd 100644
+--- a/BUILD.md
++++ b/BUILD.md
+@@ -25,7 +25,7 @@ You can download the source code archive from GitHub
+     1. `RtAudio`: Download [the source archive](https://github.com/thestk/rtaudio/archive/refs/heads/master.zip) end extract the contents of the ``rtaudio-master`` subdirectory from the archive to the ``submodules/RtAudio`` subdirectory of GrandOrgue source tree.
+     2. `RtMidi`: Download [the source archive](https://github.com/thestk/rtmidi/archive/refs/heads/master.zip) and extract the contents of the ``rtmidi-master`` subdirectory from the archive to the ``submodules/RtMidi`` subdirectory of GrandOrgue source tree.
+     3. `PortAudio`: Download [the source archive](https://github.com/PortAudio/portaudio/archive/refs/heads/master.zip) and extract the contents of the ``portaudio-master`` subdirectory from the archive to the ``submodules/PortAudio`` subdirectory of GrandOrgue source tree.
+-    4. `ZitaConvolver`: Download the source archive](https://salsa.debian.org/multimedia-team/zita-convolver/-/archive/master/zita-convolver-master.zip) and extract the contents of the ``portaudio-master`` subdirectory from the archive to the ``submodules/ZitaConvolver`` subdirectory of GrandOrgue source tree.
++    4. `ZitaConvolver`: Download [the source archive](https://salsa.debian.org/multimedia-team/zita-convolver/-/archive/master/zita-convolver-master.zip) and extract the contents of the ``zita-convolver-master`` subdirectory from the archive to the ``submodules/ZitaConvolver`` subdirectory of GrandOrgue source tree.
+ 
+ ## Building for Linux on Linux
+ 1. Make sure that GrandOrgue source tree has been extracted to some subdirectory ``<GO source tree>``
+diff --git a/src/core/GOHash.h b/src/core/GOHash.h
+index 1d1aeb9d..feae0866 100644
+--- a/src/core/GOHash.h
++++ b/src/core/GOHash.h
+@@ -8,6 +8,7 @@
+ #ifndef GOHASH_H
+ #define GOHASH_H
+ 
++#include <cstdint>
+ #include <wx/string.h>
+ 
+ #include "contrib/sha1.h"
+diff --git a/src/core/archive/GOArchiveFile.h b/src/core/archive/GOArchiveFile.h
+index 0564fcd7..6a58b020 100644
+--- a/src/core/archive/GOArchiveFile.h
++++ b/src/core/archive/GOArchiveFile.h
+@@ -8,6 +8,7 @@
+ #ifndef GOARCHIVEFILE_H
+ #define GOARCHIVEFILE_H
+ 
++#include <cstdint>
+ #include <wx/string.h>
+ 
+ #include <vector>
+diff --git a/src/core/config/GOConfigFileWriter.h b/src/core/config/GOConfigFileWriter.h
+index 8766f6a9..928c6304 100644
+--- a/src/core/config/GOConfigFileWriter.h
++++ b/src/core/config/GOConfigFileWriter.h
+@@ -8,6 +8,7 @@
+ #ifndef GOCONFIGFILEWRITER_H
+ #define GOCONFIGFILEWRITER_H
+ 
++#include <cstdint>
+ #include <wx/string.h>
+ 
+ #include <map>
+diff --git a/src/core/midi/GOMidiEvent.h b/src/core/midi/GOMidiEvent.h
+index 80634b9e..5e34cafa 100644
+--- a/src/core/midi/GOMidiEvent.h
++++ b/src/core/midi/GOMidiEvent.h
+@@ -8,6 +8,8 @@
+ #ifndef GOMIDIEVENT_H
+ #define GOMIDIEVENT_H
+ 
++#include <cstdint>
++
+ #include <vector>
+ 
+ #include "GOTime.h"
+diff --git a/src/grandorgue/model/GOTremulant.h b/src/grandorgue/model/GOTremulant.h
+index adbfcaa8..52684029 100644
+--- a/src/grandorgue/model/GOTremulant.h
++++ b/src/grandorgue/model/GOTremulant.h
+@@ -8,6 +8,7 @@
+ #ifndef GOTREMULANT_H
+ #define GOTREMULANT_H
+ 
++#include <cstdint>
+ #include <wx/string.h>
+ 
+ #include "GOCacheObject.h"
diff --git a/grandorgue.changes b/grandorgue.changes
index 702ac47..3df8ffa 100644
--- a/grandorgue.changes
+++ b/grandorgue.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Mar 27 23:29:28 UTC 2023 - Lukas Müller <expeehaa@outlook.com>
+
+- Add upstream patch fixing GCC13 errors.
+
 -------------------------------------------------------------------
 Thu Mar  9 17:44:00 UTC 2023 - Lukas Müller <expeehaa@outlook.com>
 
diff --git a/grandorgue.spec b/grandorgue.spec
index b06cca4..ebfbdd0 100644
--- a/grandorgue.spec
+++ b/grandorgue.spec
@@ -25,6 +25,7 @@ Summary:        Virtual Pipe Organ Software
 License:        GPL-2.0-or-later
 URL:            https://github.com/GrandOrgue/grandorgue
 Source:         https://github.com/GrandOrgue/grandorgue/archive/%{version}-%{version_suffix}.tar.gz#/%{name}-%{version}-%{version_suffix}.tar.gz
+Patch0:         gcc13_fix.patch
 BuildRequires:  ImageMagick
 BuildRequires:  cmake
 BuildRequires:  docbook-xsl-stylesheets
@@ -62,6 +63,7 @@ This package contains the demo sampleset for GrandOrgue.
 
 %prep
 %setup -qn %{name}-%{version}-%{version_suffix}
+%patch0 -p1
 
 %build
 %cmake -DDOC_INSTALL_DIR=%{_docdir} \