diff --git a/mods/nc_api_active/abmmux.lua b/mods/nc_api_active/abmmux.lua
new file mode 100644
index 00000000..6b8f06a5
--- /dev/null
+++ b/mods/nc_api_active/abmmux.lua
@@ -0,0 +1,83 @@
+-- LUALOCALS < ---------------------------------------------------------
+local minetest, nodecore, pairs, rawset, table
+    = minetest, nodecore, pairs, rawset, table
+local table_concat
+    = table.concat
+-- LUALOCALS > ---------------------------------------------------------
+
+local muxdefs = {}
+local abmsdefined = {}
+
+local grp = "group:"
+local function matches(name, def, nodenames)
+	for _, n in pairs(nodenames) do
+		if name == n then return true
+		elseif n:sub(1, #grp) == grp and def.groups and def.groups[n:sub(#n + 1)] then
+			return true
+		end
+	end
+end
+
+nodecore.register_on_register_item(function(name, def)
+		if def.type == "node" then
+			for _, mux in pairs(muxdefs) do
+				if matches(name, def, mux.nodenames) then
+					rawset(def.groups, "abmmux_" .. mux.muxkey, 1)
+				end
+			end
+		end
+	end)
+
+local muxidx = nodecore.item_matching_index(muxdefs,
+	function(i) return i.nodenames end,
+	"register_abm",
+	true,
+	function(n, i) return i.muxkey .. n end
+)
+
+local oldreg = minetest.register_abm
+function minetest.register_abm(def)
+	local rawkey = table_concat({
+			def.interval,
+			def.chance,
+			def.catchup and 1 or 0,
+			table_concat(def.neighbors or {}, ";")
+		}, "|")
+	local muxkey = minetest.sha1(rawkey):sub(1, 8)
+	def.muxkey = muxkey
+	muxdefs[#muxdefs + 1] = def
+	for k, v in pairs(minetest.registered_nodes) do
+		if matches(k, v, def.nodenames) then
+			rawset(v.groups, "abmmux_" .. muxkey, 1)
+			minetest.override_item(k, {groups = v.groups})
+		end
+	end
+	if abmsdefined[muxkey] then return end
+	abmsdefined[muxkey] = true
+	local abmaction
+	abmaction = function(pos, node, ...)
+		local oldname = node.name
+		local found = muxidx[muxkey .. oldname]
+		if not found then
+			abmaction = function() end
+			return
+		end
+		if #found == 1 then
+			abmaction = found[1].action
+			return found[1].action(pos, node, ...)
+		end
+		for _, d in pairs(found) do
+			d.action(pos, node, ...)
+			if minetest.get_node(pos).name ~= oldname then return end
+		end
+	end
+	return oldreg({
+			label = "mux abm for " .. rawkey,
+			interval = def.interval,
+			chance = def.chance,
+			catchup = def.catchup,
+			neighbors = def.neighbors,
+			nodenames = {"group:abmmux_" .. muxkey},
+			action = function(...) return abmaction(...) end
+		})
+end
diff --git a/mods/nc_api_active/init.lua b/mods/nc_api_active/init.lua
index ee9f6ebf..f8930acd 100644
--- a/mods/nc_api_active/init.lua
+++ b/mods/nc_api_active/init.lua
@@ -5,6 +5,7 @@ local include, nodecore
 
 nodecore.amcoremod()
 
+include("abmmux")
 include("stasis")
 include("abmhack")
 include("dnts")