diff --git a/include/REL/m401Dll.h b/include/REL/m401Dll.h
index b283cb6c..0f735435 100644
--- a/include/REL/m401Dll.h
+++ b/include/REL/m401Dll.h
@@ -72,7 +72,7 @@ void fn_2_1041C(void);
 void fn_2_10710(void);
 
 void fn_2_1079C(void);
-omObjData *fn_2_10A88(Vec *arg0, s32 arg1);
+omObjData *fn_2_10A88(Vec *arg0, s16 arg1);
 
 omObjData *fn_2_141B0(void);
 omObjData *fn_2_14640(Process *objman);
diff --git a/src/REL/m401Dll/main_ex.c b/src/REL/m401Dll/main_ex.c
index 5d600e3e..a21aa209 100644
--- a/src/REL/m401Dll/main_ex.c
+++ b/src/REL/m401Dll/main_ex.c
@@ -160,7 +160,7 @@ void fn_2_1301C(ModelData *model, ParticleData *particle, Mtx matrix);
 void fn_2_1350C(ModelData *model, ParticleData *particle, Mtx matrix);
 void fn_2_13B7C(ModelData *model, ParticleData *particle, Mtx matrix);
 
-omObjData *fn_2_10A88(Vec *arg0, s32 arg1)
+omObjData *fn_2_10A88(Vec *arg0, s16 arg1)
 {
     omObjData *temp_r31;
     s32 temp_r30;
@@ -172,7 +172,7 @@ omObjData *fn_2_10A88(Vec *arg0, s32 arg1)
     }
     {
         s16 temp_r22 = -1;
-        if ((s16)arg1 == 0) {
+        if (arg1 == 0) {
             temp_r22 = 1;
         }
         temp_r31 = omAddObjEx(HuPrcCurrentGet(), 0x514, 3, 0, temp_r22, NULL);
@@ -187,7 +187,7 @@ omObjData *fn_2_10A88(Vec *arg0, s32 arg1)
         Hu3DParticleCntSet(temp_r31->model[temp_r30], 0);
         Hu3DParticleAnimModeSet(temp_r31->model[temp_r30], 0);
         Hu3DModelLayerSet(temp_r31->model[temp_r30], 1);
-        if ((s16)arg1 == 1) {
+        if (arg1 == 1) {
             temp_r31->unk10 = fn_2_10A08();
             Hu3DModelAttrReset(temp_r31->unk10, 1);
             temp_r28->unk_44 = lbl_2_bss_220[1][temp_r30];
@@ -201,9 +201,8 @@ omObjData *fn_2_10A88(Vec *arg0, s32 arg1)
     }
     temp_r27->unk10 = 3;
     temp_r27->unk12 = temp_r24;
-    temp_r27->unk18 = (s16)arg1;
-
-    switch ((s16)arg1) {
+    temp_r27->unk18 = arg1;
+    switch (arg1) {
         case 1:
             Hu3DModelPosSet(temp_r31->unk10, arg0->x, arg0->y, lbl_2_bss_60.z + arg0->z);