diff --git a/src/game/chr/chraicommands.c b/src/game/chr/chraicommands.c
index 8f57a60df..7ca3e9f90 100644
--- a/src/game/chr/chraicommands.c
+++ b/src/game/chr/chraicommands.c
@@ -5197,29 +5197,14 @@ bool aiChrAddAlertness(void)
 /**
  * @cmd 008d
  */
-GLOBAL_ASM(
-glabel ai008d
-/*  f053600:	3c03800a */ 	lui	$v1,0x800a
-/*  f053604:	24639fc0 */ 	addiu	$v1,$v1,-24640
-/*  f053608:	8c6e0434 */ 	lw	$t6,0x434($v1)
-/*  f05360c:	8c6f0438 */ 	lw	$t7,0x438($v1)
-/*  f053610:	8c640424 */ 	lw	$a0,0x424($v1)
-/*  f053614:	27bdffe8 */ 	addiu	$sp,$sp,-24
-/*  f053618:	afbf0014 */ 	sw	$ra,0x14($sp)
-/*  f05361c:	01cf1021 */ 	addu	$v0,$t6,$t7
-/*  f053620:	90450002 */ 	lbu	$a1,0x2($v0)
-/*  f053624:	0fc12894 */ 	jal	decrementByte
-/*  f053628:	24840113 */ 	addiu	$a0,$a0,0x113
-/*  f05362c:	3c03800a */ 	lui	$v1,0x800a
-/*  f053630:	24639fc0 */ 	addiu	$v1,$v1,-24640
-/*  f053634:	8c780438 */ 	lw	$t8,0x438($v1)
-/*  f053638:	8fbf0014 */ 	lw	$ra,0x14($sp)
-/*  f05363c:	27bd0018 */ 	addiu	$sp,$sp,0x18
-/*  f053640:	27190003 */ 	addiu	$t9,$t8,0x3
-/*  f053644:	ac790438 */ 	sw	$t9,0x438($v1)
-/*  f053648:	03e00008 */ 	jr	$ra
-/*  f05364c:	00001025 */ 	or	$v0,$zero,$zero
-);
+bool aiSubtractAlertness(void)
+{
+	u8 *cmd = g_Vars.ailist + g_Vars.aioffset;
+	decrementByte(&g_Vars.chrdata->alertness, cmd[2]);
+	g_Vars.aioffset += 3;
+
+	return false;
+}
 
 /**
  * @cmd 008e
diff --git a/src/include/commands.h b/src/include/commands.h
index a8a5c455f..7ef156049 100644
--- a/src/include/commands.h
+++ b/src/include/commands.h
@@ -589,6 +589,11 @@
 	value, \
 	chr,
 
+#define subtract_alertness(value, chr) \
+	mkshort(0x008d), \
+	value, \
+	chr,
+
 #define if_alertness(value, operator, label) \
 	mkshort(0x008e), \
 	value, \
diff --git a/src/include/game/chr/chraicommands.h b/src/include/game/chr/chraicommands.h
index 1277fd496..935ae075b 100644
--- a/src/include/game/chr/chraicommands.h
+++ b/src/include/game/chr/chraicommands.h
@@ -143,7 +143,7 @@
 /*0x008a*/ bool aiSetAlertness(void);
 /*0x008b*/ bool aiAddAlertness(void);
 /*0x008c*/ bool aiChrAddAlertness(void);
-/*0x008d*/ bool ai008d(void);
+/*0x008d*/ bool aiSubtractAlertness(void);
 /*0x008e*/ bool ai008e(void);
 /*0x008f*/ bool ai008f(void);
 /*0x0090*/ bool ai0090(void);
diff --git a/src/setup/setup_000000.c b/src/setup/setup_000000.c
index 2b6d00ee9..8f57e3e81 100644
--- a/src/setup/setup_000000.c
+++ b/src/setup/setup_000000.c
@@ -14094,7 +14094,7 @@ bool (*command_pointers[])(void) = {
 	/*0x008a*/ aiSetAlertness,
 	/*0x008b*/ aiAddAlertness,
 	/*0x008c*/ aiChrAddAlertness,
-	/*0x008d*/ ai008d,
+	/*0x008d*/ aiSubtractAlertness,
 	/*0x008e*/ ai008e,
 	/*0x008f*/ ai008f,
 	/*0x0090*/ ai0090,