diff --git a/include/unk_0203CC84.h b/include/unk_0203CC84.h
deleted file mode 100644
index 86a80c03dc..0000000000
--- a/include/unk_0203CC84.h
+++ /dev/null
@@ -1,22 +0,0 @@
-#ifndef POKEPLATINUM_UNK_0203CC84_H
-#define POKEPLATINUM_UNK_0203CC84_H
-
-#include "struct_decls/struct_02018340_decl.h"
-#include "field/field_system_decl.h"
-#include "overlay_manager.h"
-#include "savedata.h"
-#include "overlay025/poketch_system.h"
-
-void sub_0203CD00(FieldSystem * param0);
-void sub_0203CD44(FieldSystem * param0);
-BOOL sub_0203CD4C(FieldSystem * param0);
-BOOL sub_0203CD5C(FieldSystem * param0);
-BOOL sub_0203CD74(FieldSystem * param0);
-void sub_0203CD84(FieldSystem * param0, const OverlayManagerTemplate * param1, void * param2);
-void sub_0203D128(void);
-void sub_0203D140(void);
-PoketchSystem * FieldSystem_PoketchSystem(void);
-BGL * sub_0203D170(void * param0);
-SaveData * FieldSystem_SaveData(void * param0);
-
-#endif // POKEPLATINUM_UNK_0203CC84_H
diff --git a/src/overlay025/poketch_system.c b/src/overlay025/poketch_system.c
index 884472e3a3..833d03b2a2 100644
--- a/src/overlay025/poketch_system.c
+++ b/src/overlay025/poketch_system.c
@@ -21,7 +21,7 @@
 #include "heap.h"
 #include "unk_0201E3D8.h"
 #include "unk_02025E08.h"
-#include "unk_0203CC84.h"
+#include "field_system.h"
 #include "trainer_info.h"
 #include "unk_020508D4.h"
 #include "unk_02099D44.h"