diff --git a/bc.lua b/bc.lua
index 9f48b0d..8b8aa3c 100644
--- a/bc.lua
+++ b/bc.lua
@@ -522,6 +522,26 @@ local function lj_value_tostring(proto, line, value)
 	return vs
 end
 
+local function lj_kgcatom_tostring(val, top)
+	local tp = type(val)
+	if tp == "string" then
+		return ([["%s"]]):format(escape_string(val))
+	elseif tp == "number" then
+		if top then
+			return ("[BYTECODE %d]"):format(val)
+		else
+			return tostring(val)
+		end
+	elseif tp == "table" then
+		if next(val) == nil then
+			return "{}"
+		end
+		return "[TABLE]"
+	else
+		return "[???]"
+	end
+end
+
 local function lj_proto_tostring(index, proto)
 	local st = {("-- BYTECODE -- %d"):format(index-1)}
 	local jmp_target = {}
@@ -536,16 +556,18 @@ local function lj_proto_tostring(index, proto)
 	end
 	for id = 0, kgc_count do
 		local val = proto.kgc[id]
-		if type(val) == "string" then
-			val = ([["%s"]]):format(escape_string(val))
-		elseif type(val) == "number" then
-			val = ("BYTECODE %d"):format(val)
-		elseif type(val) == "table" then
-			val = "[table]"
+		if type(val) == "table" and next(val) ~= nil then
+			table.insert(st, ("%-7s %6d {"):format("KGC", id))
+			local prepend = ("%-7s %6s"):format("KGC", ".")
+			-- LJ bytecode does not have nested tables
+			for k, v in pairs(val) do
+				table.insert(st, ("%s   [%s] = %s,"):format(prepend,
+					lj_kgcatom_tostring(k), lj_kgcatom_tostring(v)))
+			end
+			table.insert(st, ("%s }"):format(prepend))
 		else
-			val = "???"
+			table.insert(st, ("%-7s %6d %s"):format("KGC", id, lj_kgcatom_tostring(val, true)))
 		end
-		table.insert(st, ("%-7s %6d %s"):format("KGC", id, val))
 	end
 	local kn_count = #proto.kn
 	if proto.kn[0] == nil then