diff --git a/include/overlay005/ov5_021DDBE8.h b/include/overlay005/encounter_effect.h
similarity index 97%
rename from include/overlay005/ov5_021DDBE8.h
rename to include/overlay005/encounter_effect.h
index b4fb71cb3e..329fd023d5 100644
--- a/include/overlay005/ov5_021DDBE8.h
+++ b/include/overlay005/encounter_effect.h
@@ -1,5 +1,5 @@
-#ifndef POKEPLATINUM_OV5_021DDBE8_H
-#define POKEPLATINUM_OV5_021DDBE8_H
+#ifndef POKEPLATINUM_ENCOUNTER_EFFECT_H
+#define POKEPLATINUM_ENCOUNTER_EFFECT_H
 
 #include "struct_decls/struct_02006C24_decl.h"
 #include "struct_decls/struct_02018340_decl.h"
@@ -90,4 +90,4 @@ BOOL ov5_021DF1CC(void);
 BOOL ov5_021DF208(void);
 void ov5_021DF224(void);
 
-#endif // POKEPLATINUM_OV5_021DDBE8_H
+#endif // POKEPLATINUM_ENCOUNTER_EFFECT_H
diff --git a/platinum.us/main.lsf b/platinum.us/main.lsf
index df3507e8bc..af6169fed0 100644
--- a/platinum.us/main.lsf
+++ b/platinum.us/main.lsf
@@ -484,7 +484,7 @@ Overlay overlay5
 	Object main.nef.p/src_overlay005_ov5_021DD42C.c.o
 	Object main.nef.p/src_overlay005_ov5_021DD6FC.c.o
 	Object main.nef.p/src_overlay005_ov5_021DDAE4.c.o
-	Object main.nef.p/src_overlay005_ov5_021DDBE8.c.o
+	Object main.nef.p/src_overlay005_encounter_effect.c.o
 	Object main.nef.p/src_overlay005_ov5_021DF440.c.o
 	Object main.nef.p/src_overlay005_ov5_021DFB54.c.o
 	Object main.nef.p/src_overlay005_ov5_021E1154.c.o
diff --git a/src/enc_effects.c b/src/enc_effects.c
index 668fb4a11f..5295f76146 100644
--- a/src/enc_effects.c
+++ b/src/enc_effects.c
@@ -15,7 +15,7 @@
 #include "enc_effects.h"
 #include "unk_02054884.h"
 #include "pokemon.h"
-#include "overlay005/ov5_021DDBE8.h"
+#include "overlay005/encounter_effect.h"
 
 // This needs to be moved to a constants file somewhere
 #define ZONE_ID_PAL_PARK    251
diff --git a/src/meson.build b/src/meson.build
index 1163d0578f..a2776ad85d 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -378,7 +378,7 @@ pokeplatinum_c = files(
     'overlay005/ov5_021DD42C.c',
     'overlay005/ov5_021DD6FC.c',
     'overlay005/ov5_021DDAE4.c',
-    'overlay005/ov5_021DDBE8.c',
+    'overlay005/encounter_effect.c',
     'overlay005/ov5_021DF440.c',
     'overlay005/ov5_021DFB54.c',
     'overlay005/ov5_021E1154.c',
diff --git a/src/overlay005/ov5_021DDBE8.c b/src/overlay005/encounter_effect.c
similarity index 99%
rename from src/overlay005/ov5_021DDBE8.c
rename to src/overlay005/encounter_effect.c
index 4ea7e813f0..da223ad810 100644
--- a/src/overlay005/ov5_021DDBE8.c
+++ b/src/overlay005/encounter_effect.c
@@ -56,7 +56,7 @@
 #include "unk_02054884.h"
 #include "pokemon.h"
 #include "overlay005/ov5_021D0D80.h"
-#include "overlay005/ov5_021DDBE8.h"
+#include "overlay005/encounter_effect.h"
 #include "overlay005/ov5_021E2338.h"
 #include "overlay005/ov5_021EF3A8.h"
 
diff --git a/src/overlay005/ov5_021E2338.c b/src/overlay005/ov5_021E2338.c
index 279fb6b1ce..f53387e236 100644
--- a/src/overlay005/ov5_021E2338.c
+++ b/src/overlay005/ov5_021E2338.c
@@ -46,7 +46,7 @@
 #include "unk_0202419C.h"
 #include "unk_02025E08.h"
 #include "trainer_info.h"
-#include "overlay005/ov5_021DDBE8.h"
+#include "overlay005/encounter_effect.h"
 #include "overlay005/ov5_021E22B0.h"
 #include "overlay005/ov5_021E2338.h"
 #include "overlay005/ov5_021EF3A8.h"
diff --git a/src/unk_0205578C.c b/src/unk_0205578C.c
index 563eaefc57..c7cbf3e102 100644
--- a/src/unk_0205578C.c
+++ b/src/unk_0205578C.c
@@ -7,7 +7,7 @@
 #include "unk_020041CC.h"
 #include "heap.h"
 #include "unk_020508D4.h"
-#include "overlay005/ov5_021DDBE8.h"
+#include "overlay005/encounter_effect.h"
 
 typedef struct {
     int unk_00;