diff --git a/src/_ob_thoughtless_van.c b/src/_ob_thoughtless_van.c
index 155b35e..42e4171 100644
--- a/src/_ob_thoughtless_van.c
+++ b/src/_ob_thoughtless_van.c
@@ -1,3 +1,13 @@
 #include "common.h"
 
-INCLUDE_ASM(const s32, "_ob_thoughtless_van", func_80089990);
+#include "nu/nusys.h"
+
+/* 19D90 80089990 */
+void func_80089990(NUGfxFunc func) {
+    s32 mask;
+
+    nuGfxTaskAllEndWait();
+    mask = osSetIntMask(OS_IM_NONE);
+    nuGfxFunc = func;
+    osSetIntMask(mask);
+}