diff --git a/asm/include/overlay_03.inc b/asm/include/overlay_03_0233CA98.inc
similarity index 80%
rename from asm/include/overlay_03.inc
rename to asm/include/overlay_03_0233CA98.inc
index dc679ae0..f596e9f6 100644
--- a/asm/include/overlay_03.inc
+++ b/asm/include/overlay_03_0233CA98.inc
@@ -1,6 +1,4 @@
 #pragma once
-.public _ll_udiv
-.public _ull_mod
 .public AddItemToStorage
 .public CanSendItem
 .public CloseAdvancedMenu
@@ -43,10 +41,21 @@
 .public ItemZInit
 .public LoadFileFromRom
 .public MemAlloc
-.public MemcpySimple
 .public MemFree
 .public MemZero
+.public MemcpySimple
 .public NoteSaveBase
+.public PlaySeVolumeWrapper
+.public PrintIqSkillsMenu
+.public RandInt
+.public SetQuestionMarks
+.public ShowKeyboard
+.public StrcpyName
+.public StringFromId
+.public StrncpySimpleNoPadSafe
+.public UnloadFile
+.public _ll_udiv
+.public _ull_mod
 .public ov00_022BCA80
 .public ov00_022BCBAC
 .public ov00_022BCCF4
@@ -113,14 +122,66 @@
 .public ov01_023398B0
 .public ov01_02339988
 .public ov01_0233C1B4
-.public PlaySeVolumeWrapper
-.public PrintIqSkillsMenu
-.public RandInt
-.public SetQuestionMarks
-.public ShowKeyboard
-.public StrcpyName
-.public StringFromId
-.public StrncpySimpleNoPadSafe
+.public ov03_0233CA80
+.public ov03_02346738
+.public ov03_0234673C
+.public ov03_0234674C
+.public ov03_0234675C
+.public ov03_02346774
+.public ov03_0234678C
+.public ov03_023467A4
+.public ov03_023467BC
+.public ov03_023467C0
+.public ov03_023467D4
+.public ov03_023467EC
+.public ov03_02346804
+.public ov03_02346824
+.public ov03_02346844
+.public ov03_02346848
+.public ov03_02346864
+.public ov03_02346884
+.public ov03_023468A4
+.public ov03_023468C4
+.public ov03_023468E4
+.public ov03_023468E8
+.public ov03_02346904
+.public ov03_02346908
+.public ov03_0234692C
+.public ov03_02346930
+.public ov03_02346954
+.public ov03_02346958
+.public ov03_0234697C
+.public ov03_023469A4
+.public ov03_023469A8
+.public ov03_023469D4
+.public ov03_023469D8
+.public ov03_02346A04
+.public ov03_02346A34
+.public ov03_02346A38
+.public ov03_02346A64
+.public ov03_02346A68
+.public ov03_02346A6C
+.public ov03_02346A84
+.public ov03_02346A90
+.public ov03_02346A9C
+.public ov03_02346AAC
+.public ov03_02346ABC
+.public ov03_02346AC8
+.public ov03_02346AD8
+.public ov03_02346AE8
+.public ov03_02346AF8
+.public ov03_02346B20
+.public ov03_02346BB8
+.public ov03_02346BBC
+.public ov03_02346BC0
+.public ov03_02346BC4
+.public ov03_02346BC8
+.public ov03_02346BCC
+.public ov03_02346BD4
+.public ov03_02346BD8
+.public ov03_02346BDC
+.public ov03_02346BE0
+.public ov03_02346BF0
 .public sub_02003B94
 .public sub_02003BC8
 .public sub_02003BFC
@@ -243,4 +304,3 @@
 .public sub_020698B8
 .public sub_02069904
 .public sub_02069940
-.public UnloadFile
diff --git a/asm/overlay_03.s b/asm/overlay_03_0233CA98.s
similarity index 99%
rename from asm/overlay_03.s
rename to asm/overlay_03_0233CA98.s
index 17c30178..44f171ff 100644
--- a/asm/overlay_03.s
+++ b/asm/overlay_03_0233CA98.s
@@ -1,19 +1,8 @@
 	.include "asm/macros.inc"
-	.include "overlay_03.inc"
+	.include "overlay_03_0233CA98.inc"
 
 	.text
 
-	arm_func_start ov03_0233CA80
-ov03_0233CA80: ; 0x0233CA80
-	ldr ip, _0233CA90 ; =MemZero
-	ldr r0, _0233CA94 ; =ov03_02346BE0
-	mov r1, #0x10
-	bx ip
-	.align 2, 0
-_0233CA90: .word MemZero
-_0233CA94: .word ov03_02346BE0
-	arm_func_end ov03_0233CA80
-
 	arm_func_start ov03_0233CA98
 ov03_0233CA98: ; 0x0233CA98
 	ldr r1, _0233CAA4 ; =ov03_02346BE0
@@ -11773,9 +11762,6 @@ ov03_02346BDC:
 	.byte 0x00, 0x00, 0x00, 0x00
 
 	.bss
-	.global ov03_02346BE0
-ov03_02346BE0:
-	.space 0x10
 	.global ov03_02346BF0
 ov03_02346BF0:
 	.space 0x10
diff --git a/include/overlay_03_0233CA80.h b/include/overlay_03_0233CA80.h
new file mode 100644
index 00000000..ae3adfb7
--- /dev/null
+++ b/include/overlay_03_0233CA80.h
@@ -0,0 +1,13 @@
+#ifndef PMDSKY_OVERLAY_03_0233CA80_H
+#define PMDSKY_OVERLAY_03_0233CA80_H
+
+struct Overlay03Main
+{
+    u32 unk0;
+    u32 unk4;
+    u8 fill8[0x10 - 8];
+};
+
+void ov03_0233CA80(void);
+
+#endif //PMDSKY_OVERLAY_03_0233CA80_H
diff --git a/main.lsf b/main.lsf
index 4a1e9163..38e88d1b 100644
--- a/main.lsf
+++ b/main.lsf
@@ -73,7 +73,8 @@ Overlay OVY_2
 Overlay OVY_3
 {
 	After OVY_1
-	Object asm/overlay_03.o
+	Object src/overlay_03_0233CA80.o
+	Object asm/overlay_03_0233CA98.o
 }
 Overlay OVY_4
 {
diff --git a/src/overlay_03_0233CA80.c b/src/overlay_03_0233CA80.c
new file mode 100644
index 00000000..443eb0e6
--- /dev/null
+++ b/src/overlay_03_0233CA80.c
@@ -0,0 +1,9 @@
+#include "overlay_03_0233CA80.h"
+
+extern void MemZero(void* ptr, u32 len);
+
+struct Overlay03Main ov03_02346BE0;
+
+void ov03_0233CA80(void) {
+    MemZero(&ov03_02346BE0, 0x10);
+}