diff --git a/include/SDL_config.h.cmake b/include/SDL_config.h.cmake
index 3d635417f..b006545a5 100644
--- a/include/SDL_config.h.cmake
+++ b/include/SDL_config.h.cmake
@@ -305,6 +305,7 @@
 #cmakedefine SDL_JOYSTICK_MFI @SDL_JOYSTICK_MFI@
 #cmakedefine SDL_JOYSTICK_LINUX @SDL_JOYSTICK_LINUX@
 #cmakedefine SDL_JOYSTICK_WINMM @SDL_JOYSTICK_WINMM@
+#cmakedefine SDL_JOYSTICK_OS2 @SDL_JOYSTICK_OS2@
 #cmakedefine SDL_JOYSTICK_USBHID @SDL_JOYSTICK_USBHID@
 #cmakedefine SDL_JOYSTICK_USBHID_MACHINE_JOYSTICK_H @SDL_JOYSTICK_USBHID_MACHINE_JOYSTICK_H@
 #cmakedefine SDL_JOYSTICK_HIDAPI @SDL_JOYSTICK_HIDAPI@
diff --git a/include/SDL_config.h.in b/include/SDL_config.h.in
index 511667909..d40cac513 100644
--- a/include/SDL_config.h.in
+++ b/include/SDL_config.h.in
@@ -307,6 +307,7 @@
 #undef SDL_JOYSTICK_LINUX
 #undef SDL_JOYSTICK_ANDROID
 #undef SDL_JOYSTICK_WINMM
+#undef SDL_JOYSTICK_OS2
 #undef SDL_JOYSTICK_USBHID
 #undef SDL_JOYSTICK_USBHID_MACHINE_JOYSTICK_H
 #undef SDL_JOYSTICK_HIDAPI