diff --git a/autogen/lua_definitions/constants.lua b/autogen/lua_definitions/constants.lua
index a20b1634..887e8a12 100644
--- a/autogen/lua_definitions/constants.lua
+++ b/autogen/lua_definitions/constants.lua
@@ -7597,6 +7597,9 @@ ACT_IDLE = 0x0C400201
 --- @type integer
 ACT_ID_MASK = 0x000001FF
 
+--- @type integer
+ACT_INDEX_MASK = (ACT_ID_MASK & ~ACT_GROUP_MASK)
+
 --- @type integer
 ACT_INTRO_CUTSCENE = 0x04001301
 
@@ -7672,6 +7675,12 @@ ACT_METAL_WATER_WALKING = 0x000044F2
 --- @type integer
 ACT_MOVE_PUNCHING = 0x00800457
 
+--- @type integer
+ACT_NUM_ACTIONS_PER_GROUP = (ACT_INDEX_MASK + 1)
+
+--- @type integer
+ACT_NUM_GROUPS = ((ACT_GROUP_MASK >> 6) + 1)
+
 --- @type integer
 ACT_PANTING = 0x0C400205
 
diff --git a/docs/lua/constants.md b/docs/lua/constants.md
index f1a0a4d4..85cdd591 100644
--- a/docs/lua/constants.md
+++ b/docs/lua/constants.md
@@ -2714,6 +2714,7 @@
 - ACT_HOLD_WATER_JUMP
 - ACT_IDLE
 - ACT_ID_MASK
+- ACT_INDEX_MASK
 - ACT_INTRO_CUTSCENE
 - ACT_IN_CANNON
 - ACT_IN_QUICKSAND
@@ -2739,6 +2740,8 @@
 - ACT_METAL_WATER_STANDING
 - ACT_METAL_WATER_WALKING
 - ACT_MOVE_PUNCHING
+- ACT_NUM_ACTIONS_PER_GROUP
+- ACT_NUM_GROUPS
 - ACT_PANTING
 - ACT_PICKING_UP
 - ACT_PICKING_UP_BOWSER
diff --git a/include/sm64.h b/include/sm64.h
index 02e1490f..80bdd25b 100644
--- a/include/sm64.h
+++ b/include/sm64.h
@@ -151,6 +151,10 @@
 #define ACT_GROUP_AUTOMATIC  /* 0x00000140 */ (5 << 6)
 #define ACT_GROUP_OBJECT     /* 0x00000180 */ (6 << 6)
 
+#define ACT_INDEX_MASK              (ACT_ID_MASK & ~ACT_GROUP_MASK)
+#define ACT_NUM_GROUPS              ((ACT_GROUP_MASK >> 6) + 1)
+#define ACT_NUM_ACTIONS_PER_GROUP   (ACT_INDEX_MASK + 1)
+
 #define ACT_FLAG_STATIONARY                  /* 0x00000200 */ (1 <<  9)
 #define ACT_FLAG_MOVING                      /* 0x00000400 */ (1 << 10)
 #define ACT_FLAG_AIR                         /* 0x00000800 */ (1 << 11)
diff --git a/src/pc/lua/smlua_constants_autogen.c b/src/pc/lua/smlua_constants_autogen.c
index 70fe6058..6f747c71 100644
--- a/src/pc/lua/smlua_constants_autogen.c
+++ b/src/pc/lua/smlua_constants_autogen.c
@@ -2678,6 +2678,9 @@ char gSmluaConstants[] = ""
 "ACT_GROUP_CUTSCENE = (4 << 6)\n"
 "ACT_GROUP_AUTOMATIC = (5 << 6)\n"
 "ACT_GROUP_OBJECT = (6 << 6)\n"
+"ACT_INDEX_MASK = (ACT_ID_MASK & ~ACT_GROUP_MASK)\n"
+"ACT_NUM_GROUPS = ((ACT_GROUP_MASK >> 6) + 1)\n"
+"ACT_NUM_ACTIONS_PER_GROUP = (ACT_INDEX_MASK + 1)\n"
 "ACT_FLAG_STATIONARY = (1 << 9)\n"
 "ACT_FLAG_MOVING = (1 << 10)\n"
 "ACT_FLAG_AIR = (1 << 11)\n"
diff --git a/src/pc/lua/smlua_hooks.c b/src/pc/lua/smlua_hooks.c
index a253a079..3ff71793 100644
--- a/src/pc/lua/smlua_hooks.c
+++ b/src/pc/lua/smlua_hooks.c
@@ -1,4 +1,5 @@
 #include "smlua.h"
+#include "sm64.h"
 #include "behavior_commands.h"
 #include "pc/mods/mod.h"
 #include "src/game/object_list_processor.h"
@@ -851,11 +852,11 @@ struct LuaHookedMarioAction {
     struct Mod* mod;
 };
 
-#define MAX_HOOKED_ACTIONS 128
+#define MAX_HOOKED_ACTIONS (ACT_NUM_GROUPS * ACT_NUM_ACTIONS_PER_GROUP)
 
 static struct LuaHookedMarioAction sHookedMarioActions[MAX_HOOKED_ACTIONS] = { 0 };
 static int sHookedMarioActionsCount = 0;
-u32 gLuaMarioActionIndex = 0;
+u32 gLuaMarioActionIndex[ACT_NUM_GROUPS] = { 0 };
 
 int smlua_hook_mario_action(lua_State* L) {
     if (L == NULL) { return 0; }
@@ -1564,7 +1565,7 @@ void smlua_clear_hooks(void) {
         hooked->mod = NULL;
     }
     sHookedBehaviorsCount = 0;
-    gLuaMarioActionIndex = 0;
+    memset(gLuaMarioActionIndex, 0, sizeof(gLuaMarioActionIndex));
 }
 
 void smlua_bind_hooks(void) {
diff --git a/src/pc/lua/smlua_hooks.h b/src/pc/lua/smlua_hooks.h
index 2980b4d3..38f1d4e1 100644
--- a/src/pc/lua/smlua_hooks.h
+++ b/src/pc/lua/smlua_hooks.h
@@ -98,7 +98,7 @@ static const char* LuaActionHookTypeArgName[] = {
     "max (dummy)",
 };
 
-extern u32 gLuaMarioActionIndex;
+extern u32 gLuaMarioActionIndex[];
 
 int smlua_hook_custom_bhv(BehaviorScript *bhvScript, const char *bhvName);
 
diff --git a/src/pc/lua/utils/smlua_misc_utils.c b/src/pc/lua/utils/smlua_misc_utils.c
index 770d2a96..fbdda7ea 100644
--- a/src/pc/lua/utils/smlua_misc_utils.c
+++ b/src/pc/lua/utils/smlua_misc_utils.c
@@ -441,8 +441,13 @@ bool is_transition_playing(void) {
 ///
 
 u32 allocate_mario_action(u32 actFlags) {
-    actFlags = actFlags & (~((u32)0x3F));
-    return actFlags | ACT_FLAG_CUSTOM_ACTION | gLuaMarioActionIndex++;
+    u32 actGroup = ((actFlags & ACT_GROUP_MASK) >> 6);
+    u32 actIndex = gLuaMarioActionIndex[actGroup]++;
+    if (actIndex >= ACT_NUM_ACTIONS_PER_GROUP) {
+        LOG_LUA("Cannot allocate more actions for group %u", actGroup);
+        return 0;
+    }
+    return (actFlags & ~ACT_INDEX_MASK) | ACT_FLAG_CUSTOM_ACTION | actIndex;
 }
 
 ///