diff --git a/include/code_8099360.h b/include/code_8099360.h
index b2ce021ca..0c766c621 100644
--- a/include/code_8099360.h
+++ b/include/code_8099360.h
@@ -3,7 +3,7 @@
 
 
 bool8 sub_8099360(u8 *);
-u8 sub_8099394(volatile u8 *);
+u8 sub_8099394(u8 *);
 void sub_80993C0(bool8);
 void sub_80993D8(void);
 void sub_80993E4(void);
diff --git a/src/code_8099360.c b/src/code_8099360.c
index e1f127b39..709536fe4 100644
--- a/src/code_8099360.c
+++ b/src/code_8099360.c
@@ -30,13 +30,13 @@ bool8 sub_8099360(u8 *dungeonId) {
     return FALSE;
 }
 
-u8 sub_8099394(volatile u8 *param) {
+u8 sub_8099394(u8 *param) {
     s16 script_disc;
 
     script_disc = GetScriptVarValue(NULL, DUNGEON_ENTER);
     if (script_disc == 0x50) {
         script_disc = GetScriptVarValue(NULL, DUNGEON_ENTER_INDEX);
-        *(u8 *)param = script_disc;
+        *param = script_disc;
         return TRUE;
     }
     return FALSE;
diff --git a/src/post_office_guide2.c b/src/post_office_guide2.c
index 3741d46f7..78398bdb3 100644
--- a/src/post_office_guide2.c
+++ b/src/post_office_guide2.c
@@ -113,7 +113,7 @@ static void DisplayMissionObjectives(void)
 
     switch (sUnknown_203B330->unkC) {
         case 1:
-            sub_8099394(&local_94);
+            sub_8099394((u8*)&local_94);
             mail = GetMailatIndex(local_94);
             sub_803B6B0(10, 16, 3, sUnknown_203B330->unk10);
             // %dF