diff --git a/src/md_MAIN_033/md_MAIN_033.c b/src/md_MAIN_033/md_MAIN_033.c
index 9f8c1f306..be2233a8b 100644
--- a/src/md_MAIN_033/md_MAIN_033.c
+++ b/src/md_MAIN_033/md_MAIN_033.c
@@ -262,7 +262,7 @@ s32 func_800CB3D8(s32 arg0, s32 arg1) {
     extern void func_8012F14C(s32, s32, s32);
     extern void func_80015978(s32, s32 *);
     extern void func_80015954(s32, s32);
-    extern s32 func_800CB4EC(s32 a0);
+    extern s32 func_800CB4EC();
 
     struct S { s32 f[8]; };
     struct S st;
@@ -281,7 +281,7 @@ s32 func_800CB3D8(s32 arg0, s32 arg1) {
     *(u16 *)(arg0 + 6) += out2[0];
     *(u16 *)(arg0 + 0xA) += out2[1];
     *(u16 *)(arg0 + 0xE) += out2[2];
-    ret = ((s32 (*)())func_800CB4EC)(arg0);
+    ret = func_800CB4EC(arg0);
     func_80015954((s32)out1, arg0 + 4);
     return ret;
 }
diff --git a/src/ov_SC01_005/ov_SC01_005_jr_8017C340.c b/src/ov_SC01_005/ov_SC01_005_jr_8017C340.c
index 3c6b4040b..5e307e602 100644
--- a/src/ov_SC01_005/ov_SC01_005_jr_8017C340.c
+++ b/src/ov_SC01_005/ov_SC01_005_jr_8017C340.c
@@ -3893,7 +3893,7 @@ void func_8017E258(void) {
     extern s32 func_801399F0(s32);
     extern s32 func_80014ED4(s32);
     extern s16 func_8014168C(s16);
-    extern s32 func_8017F2D4(s32 a0, s32 a1);
+    extern s32 func_8017F2D4();
     extern void func_80139954(void);
     extern void func_8002D4C8(s32, s32);
     extern void func_8017E6BC(void);
@@ -3914,7 +3914,7 @@ void func_8017E258(void) {
             u16 t;
             t = D_8011511A;
             if (D_80115138[t] == 8) {
-                ((s32 (*)())func_8017F2D4)(0xF, func_8014168C(t));
+                func_8017F2D4(0xF, func_8014168C(t));
             }
             if (D_801CD870 != 0) {
                 func_80139954();
@@ -3958,7 +3958,7 @@ extern void func_8002D4C8(s32 a0, s32 a1);
 extern s32 func_80014ED4(s32 a0);
 extern s32 func_80015018(s32 a0);
 extern s16 func_8014168C(s16 a0);
-extern s32 func_8017F2D4(s32 a0, s32 a1);
+extern s32 func_8017F2D4();
 extern void func_8017DEFC(void);
 
 s32 func_8017E3DC(void) {
@@ -3994,7 +3994,7 @@ s32 func_8017E3DC(void) {
     c = D_80115138[*p11a];
 
     if ((flags & 0x40) != 0) {
-        ret = ((s32 (*)())func_8017F2D4)(c, ret);
+        ret = func_8017F2D4(c, ret);
         nz = ret != 0;
         return ret & -nz;
     }
diff --git a/src/ov_SC01_005/ov_SC01_005_jr_8017EB44.c b/src/ov_SC01_005/ov_SC01_005_jr_8017EB44.c
index a6e7bee70..a406e0342 100644
--- a/src/ov_SC01_005/ov_SC01_005_jr_8017EB44.c
+++ b/src/ov_SC01_005/ov_SC01_005_jr_8017EB44.c
@@ -2718,7 +2718,7 @@ extern void func_8017E384(void);
 extern s32 func_80014ED4(s32 a0);
 extern s32 func_80015018(s32 a0);
 extern s16 func_8014168C(s16 a0);
-extern s32 func_8017F2D4(s32 a0, s32 a1);
+extern s32 func_8017F2D4();
 extern s32 func_8017E3DC(void);
 extern void func_8017E6BC(void);
 extern u16 D_8011511A;
diff --git a/src/ov_SC01_005/ov_SC01_005_jr_8017ED5C.c b/src/ov_SC01_005/ov_SC01_005_jr_8017ED5C.c
index e5e58910b..35156ea75 100644
--- a/src/ov_SC01_005/ov_SC01_005_jr_8017ED5C.c
+++ b/src/ov_SC01_005/ov_SC01_005_jr_8017ED5C.c
@@ -2718,7 +2718,7 @@ extern void func_8017E384(void);
 extern s32 func_80014ED4(s32 a0);
 extern s32 func_80015018(s32 a0);
 extern s16 func_8014168C(s16 a0);
-extern s32 func_8017F2D4(s32 a0, s32 a1);
+extern s32 func_8017F2D4();
 extern s32 func_8017E3DC(void);
 extern void func_8017E6BC(void);
 extern u16 D_8011511A;
diff --git a/src/ov_SC01_006/ov_SC01_006_jr_8017C340.c b/src/ov_SC01_006/ov_SC01_006_jr_8017C340.c
index fb5acc1aa..29b3cc6e2 100644
--- a/src/ov_SC01_006/ov_SC01_006_jr_8017C340.c
+++ b/src/ov_SC01_006/ov_SC01_006_jr_8017C340.c
@@ -3905,7 +3905,7 @@ void func_8017E258(void) {
     extern s32 func_801399F0(s32);
     extern s32 func_80014ED4(s32);
     extern s16 func_8014168C(s16);
-    extern s32 func_8017F2D4(s32 a0, s32 a1);
+    extern s32 func_8017F2D4();
     extern void func_80139954(void);
     extern void func_8002D4C8(s32, s32);
     extern void func_8017E6BC(void);
@@ -3926,7 +3926,7 @@ void func_8017E258(void) {
             u16 t;
             t = D_8011511A;
             if (D_80115138[t] == 8) {
-                ((s32 (*)())func_8017F2D4)(0xF, func_8014168C(t));
+                func_8017F2D4(0xF, func_8014168C(t));
             }
             if (D_801CD870 != 0) {
                 func_80139954();
@@ -3971,7 +3971,7 @@ extern void func_8002D4C8(s32 a0, s32 a1);
 extern s32 func_80014ED4(s32 a0);
 extern s32 func_80015018(s32 a0);
 extern s16 func_8014168C(s16 a0);
-extern s32 func_8017F2D4(s32 a0, s32 a1);
+extern s32 func_8017F2D4();
 extern void func_8017DEFC(void);
 
 s32 func_8017E3DC(void) {
@@ -4007,7 +4007,7 @@ s32 func_8017E3DC(void) {
     c = D_80115138[*p11a];
 
     if ((flags & 0x40) != 0) {
-        ret = ((s32 (*)())func_8017F2D4)(c, ret);
+        ret = func_8017F2D4(c, ret);
         nz = ret != 0;
         return ret & -nz;
     }
diff --git a/src/ov_SC01_006/ov_SC01_006_jr_8017EB44.c b/src/ov_SC01_006/ov_SC01_006_jr_8017EB44.c
index ef6c4eb0f..0e30b6f5f 100644
--- a/src/ov_SC01_006/ov_SC01_006_jr_8017EB44.c
+++ b/src/ov_SC01_006/ov_SC01_006_jr_8017EB44.c
@@ -2712,7 +2712,7 @@ extern void func_8017E384(void);
 extern s32 func_80014ED4(s32 a0);
 extern s32 func_80015018(s32 a0);
 extern s16 func_8014168C(s16 a0);
-extern s32 func_8017F2D4(s32 a0, s32 a1);
+extern s32 func_8017F2D4();
 extern s32 func_8017E3DC(void);
 extern void func_8017E6BC(void);
 extern void  func_80024054(void *a0, void *a1);
diff --git a/src/ov_SC01_006/ov_SC01_006_jr_8017ED5C.c b/src/ov_SC01_006/ov_SC01_006_jr_8017ED5C.c
index 31d298a0e..01ea3c231 100644
--- a/src/ov_SC01_006/ov_SC01_006_jr_8017ED5C.c
+++ b/src/ov_SC01_006/ov_SC01_006_jr_8017ED5C.c
@@ -2711,7 +2711,7 @@ extern void func_8017E384(void);
 extern s32 func_80014ED4(s32 a0);
 extern s32 func_80015018(s32 a0);
 extern s16 func_8014168C(s16 a0);
-extern s32 func_8017F2D4(s32 a0, s32 a1);
+extern s32 func_8017F2D4();
 extern void func_8017DEFC(void);
 extern s32 func_8017E3DC(void);
 extern void func_8017E6BC(void);
diff --git a/src/ov_SC02_000/ov_SC02_000_jr_80180D6C.c b/src/ov_SC02_000/ov_SC02_000_jr_80180D6C.c
index f30ff14a7..56ab0982a 100644
--- a/src/ov_SC02_000/ov_SC02_000_jr_80180D6C.c
+++ b/src/ov_SC02_000/ov_SC02_000_jr_80180D6C.c
@@ -2987,7 +2987,7 @@ void func_80180D6C(s32 param_1) {
 }
 
 
-extern void func_8017F950(s32 a0);
+extern void func_8017F950();
 extern s32 D_801270D8;
 extern s16 D_8018E6CC;
 extern s16 D_8018E6D0;
@@ -3011,7 +3011,7 @@ void func_8018127C(s32 param_1) {
     u16 t;
 
     if ((*(u16 *)(param_1 + 0x5C) & 1) != 0) {
-        ((void (*)())func_8017F950)();
+        func_8017F950();
     }
     if ((*(u16 *)(param_1 + 0x70) & 0x400) != 0 && D_801270D8 != 0 &&
         *(u16 *)(param_1 + 0x2) != 0xA) {
diff --git a/src/ov_SC02_003/ov_SC02_003_jr_80180D6C.c b/src/ov_SC02_003/ov_SC02_003_jr_80180D6C.c
index 8b66f2cba..a13cc77ba 100644
--- a/src/ov_SC02_003/ov_SC02_003_jr_80180D6C.c
+++ b/src/ov_SC02_003/ov_SC02_003_jr_80180D6C.c
@@ -2987,7 +2987,7 @@ void func_80180D6C(s32 param_1) {
 }
 
 
-extern void func_8017F950(s32 a0);
+extern void func_8017F950();
 extern s32 D_801270D8;
 extern s16 D_8018E6CC;
 extern s16 D_8018E6D0;
@@ -3011,7 +3011,7 @@ void func_8018127C(s32 param_1) {
     u16 t;
 
     if ((*(u16 *)(param_1 + 0x5C) & 1) != 0) {
-        ((void (*)())func_8017F950)();
+        func_8017F950();
     }
     if ((*(u16 *)(param_1 + 0x70) & 0x400) != 0 && D_801270D8 != 0 &&
         *(u16 *)(param_1 + 0x2) != 0xA) {
diff --git a/src/ov_SC07_000/ov_SC07_000_jr_8017BEBC.c b/src/ov_SC07_000/ov_SC07_000_jr_8017BEBC.c
index 71f438785..1d9d8c10a 100644
--- a/src/ov_SC07_000/ov_SC07_000_jr_8017BEBC.c
+++ b/src/ov_SC07_000/ov_SC07_000_jr_8017BEBC.c
@@ -5382,7 +5382,7 @@ void func_80180CEC(s32 a0) {
     if (*(u16 *)&D_801D0B7C == 4) {
         func_8017F554(s0);
     }
-    ((void (*)())func_8017F8B8)(s0);
+    func_8017F8B8(s0);
 }
 
 
diff --git a/src/resident/resident.c b/src/resident/resident.c
index c42b3062b..a480aa6ca 100644
--- a/src/resident/resident.c
+++ b/src/resident/resident.c
@@ -955,7 +955,7 @@ s32 func_800CFE60(void) {
     extern s32 func_80029504(void);
     extern s32 func_80029178(s32);
     extern s32 func_8002F658(void);
-    extern void func_800D00E4(s32 arg0);
+    extern void func_800D00E4();
     extern s32 CdReadRequest(void *, void *, s32, s32);
 
     register u8 *base __asm__("$20");
@@ -1020,7 +1020,7 @@ s32 func_800CFE60(void) {
     }
 
     if (mode == 0 && (res & 1)) {
-        ((void (*)())func_800D00E4)((((u32)D_800D34AC[*(s16 *)(base + 0xA3D8) & 0xFFFF0FFF]) >> 12) & 0xF);
+        func_800D00E4((((u32)D_800D34AC[*(s16 *)(base + 0xA3D8) & 0xFFFF0FFF]) >> 12) & 0xF);
     }
     return res;
 }