diff --git a/pkgs/by-name/on/onboard/bool.patch b/pkgs/by-name/on/onboard/bool.patch
new file mode 100644
index 000000000000..21fa96325b5c
--- /dev/null
+++ b/pkgs/by-name/on/onboard/bool.patch
@@ -0,0 +1,10 @@
+Author: @vcunat
+
+    Don't redefine bool and use the standard one instead.
+
+--- a/Onboard/osk/osk_module.h
++++ b/Onboard/osk/osk_module.h
+@@ -28 +28 @@
+-typedef enum { false, true } bool;
++#include <stdbool.h>
+
diff --git a/pkgs/by-name/on/onboard/package.nix b/pkgs/by-name/on/onboard/package.nix
index 7a2e35306d84..804c89170235 100644
--- a/pkgs/by-name/on/onboard/package.nix
+++ b/pkgs/by-name/on/onboard/package.nix
@@ -72,6 +72,8 @@ python3.pkgs.buildPythonApplication rec {
       url = "https://github.com/void-linux/void-packages/raw/9ef46bf26ac5acc1af5809f11c97b19c5e2233ed/srcpkgs/onboard/patches/fix-brokenformat.patch";
       hash = "sha256-r9mvJNWpPR1gsayuSSLpzIuafEKqtADYklre0Ju+KOM=";
     })
+
+    ./bool.patch
   ];
 
   nativeBuildInputs = [