diff --git a/undefined_syms.txt b/undefined_syms.txt
index 5c2fcb02ff..eda4353687 100644
--- a/undefined_syms.txt
+++ b/undefined_syms.txt
@@ -26,6 +26,9 @@ func_801C8510_unknown = 0x801C8510;
 D_801DA410 = 0x801DA410;
 D_801E8090 = 0x801E8090;
 
+// z_setup.c
+n64dd_SetDiskVersion = 0x801C8808;
+
 // z_title.c
 func_800014E8_unknown = 0x800014E8;
 func_801C8090_unknown = 0x801C8090;