diff --git a/src/joystick/SDL_joystick.c b/src/joystick/SDL_joystick.c
index 7ad57396a..73b2c8315 100644
--- a/src/joystick/SDL_joystick.c
+++ b/src/joystick/SDL_joystick.c
@@ -25,6 +25,8 @@
 #include "SDL_events.h"
 #include "SDL_sysjoystick.h"
 #include "SDL_joystick_c.h"
+#include "SDL_assert.h"
+
 #if !SDL_EVENTS_DISABLED
 #include "../events/SDL_events_c.h"
 #endif