diff --git a/src/joystick/os2/SDL_os2joystick.c b/src/joystick/os2/SDL_os2joystick.c
index 5d39df8494..00b7fc554d 100644
--- a/src/joystick/os2/SDL_os2joystick.c
+++ b/src/joystick/os2/SDL_os2joystick.c
@@ -184,6 +184,7 @@ static int OS2_JoystickInit(void)
 		joyPortClose(&hJoyPort);
 		return SDL_SetError("Could not read joystick port.");
 	}
+	maxdevs = 0;
 	if (stGameParms.useA != 0) maxdevs++;
 	if (stGameParms.useB != 0) maxdevs++;
 	if (maxdevs > MAX_JOYSTICKS) maxdevs = MAX_JOYSTICKS;