diff --git a/include/rel/d/a/d_a_do/d_a_do.h b/include/rel/d/a/d_a_do/d_a_do.h
index c21f958edd1..22fb7709e2b 100644
--- a/include/rel/d/a/d_a_do/d_a_do.h
+++ b/include/rel/d/a/d_a_do/d_a_do.h
@@ -23,7 +23,9 @@ class do_class : public fopAc_ac_c {
 public:
     /* 0x56C */ u8 field_0x56c[68];
     /* 0x5AC */ request_of_phase_process_class mPhase;
-    /* 0x5B4 */ u8 field_0x5b4[20];
+    /* 0x5B4 */ u8 field_0x5b4[2];
+    /* 0x5B6 */ u8 field_0x5b6;
+    /* 0x5B7 */ u8 field_0x5b7[17];
     /* 0x5C8 */ float field_0x5c8;
     /* 0x5CC */ u8 field_0x5cc[4];
     /* 0x5D8 */ mDoExt_McaMorf* mpMorf;
@@ -35,10 +37,12 @@ public:
     /* 0x5F0 */ u8 field_0x5f0[2];
     /* 0x5F2 */ s16 field_0x5f2;
     /* 0x5F4 */ u8 field_0x5f4[2];
-    /* 0x5F6 */ u16 field_0x5f6;
+    /* 0x5F6 */ s16 field_0x5f6;
     /* 0x5F8 */ u8 field_0x5f8[4];
     /* 0x5FC */ u16 field_0x5fc;
-    /* 0x5FE */ u8 field_0x5fe[6];
+    /* 0x5FE */ u8 field_0x5fe[2];
+    /* 0x600 */ s16 field_0x600;
+    /* 0x602 */ u8 field_0x602[2];
     /* 0x604 */ u16 field_0x604;
     /* 0x606 */ u8 field_0x606[2];
     /* 0x608 */ float field_0x608;
diff --git a/rel/d/a/d_a_do/d_a_do.cpp b/rel/d/a/d_a_do/d_a_do.cpp
index 196ce4f32e4..2f35dc147dc 100644
--- a/rel/d/a/d_a_do/d_a_do.cpp
+++ b/rel/d/a/d_a_do/d_a_do.cpp
@@ -10,6 +10,7 @@
 #include "dolphin/types.h"
 #include "f_op/f_op_actor_mng.h"
 #include "f_pc/f_pc_executor.h"
+#include "SSystem/SComponent/c_math.h"
 
 //
 // Forward References:
@@ -1048,6 +1049,20 @@ COMPILER_STRIP_GATE(0x8066EE58, &lit_4138);
 #pragma pop
 
 /* 80668BA0-80668D5C 000F40 01BC+00 5/5 0/0 0/0 .text            area_check__FP8do_class */
+#ifdef NONMATCHING
+// matches with literals
+static void area_check(do_class* i_dogP) {
+    cXyz pos_delta = i_dogP->orig.pos - i_dogP->current.pos;
+
+    if (i_dogP->field_0x5b6 != 255) {
+        if ((i_dogP->field_0x5b6 * 100.f * 2.0f) > pos_delta.abs()) {
+            i_dogP->field_0x5f2 = 1;
+            i_dogP->field_0x5f6 = -1;
+            i_dogP->field_0x600 = cM_rndF(100.0f) + 100.0f; // random value between 100 and 200
+        }
+    }
+}
+#else
 #pragma push
 #pragma optimization_level 0
 #pragma optimizewithasm off
@@ -1056,6 +1071,7 @@ static asm void area_check(do_class* i_dogP) {
 #include "asm/rel/d/a/d_a_do/d_a_do/area_check__FP8do_class.s"
 }
 #pragma pop
+#endif
 
 /* ############################################################################################## */
 /* 8066EE60-8066EE64 000078 0004+00 0/5 0/0 0/0 .rodata          @4189 */