diff --git a/libogc/system.c b/libogc/system.c
index c785f13..58a4ad4 100644
--- a/libogc/system.c
+++ b/libogc/system.c
@@ -205,6 +205,7 @@ const void *__libogc_lock_acquire = __syscall_lock_acquire;
 const void *__libogc_lock_try_acquire = __syscall_lock_try_acquire;
 const void *__libogc_lock_release = __syscall_lock_release;
 const void *__libogc_exit = __syscall_exit;
+extern void *_sbrk_r(struct _reent *ptr, ptrdiff_t incr);
 const void *__libogc_sbrk_r = _sbrk_r;
 const void *__libogc_gettod_r = __syscall_gettod_r;
 const void *__libogc_clock_gettime = __syscall_clock_gettime;