diff --git a/src/link.c b/src/link.c
index 8f7aa71b6..292ffecf2 100644
--- a/src/link.c
+++ b/src/link.c
@@ -28,6 +28,8 @@
 #include "link.h"
 #include "link_rfu.h"
 
+extern u16 gUnknown_03005DA8;
+
 // Static type declarations
 
 struct BlockTransfer
diff --git a/src/link_rfu.c b/src/link_rfu.c
index 186d54fd3..a1917ed24 100644
--- a/src/link_rfu.c
+++ b/src/link_rfu.c
@@ -16,6 +16,8 @@
 #include "rom_8011DC0.h"
 #include "link_rfu.h"
 
+extern u16 gUnknown_03005DA8;
+
 // Static type declarations
 
 // Static RAM declarations