diff --git a/lzwfs/lzwfs.lua b/lzwfs/lzwfs.lua
index 3c2a7ee..46aa869 100644
--- a/lzwfs/lzwfs.lua
+++ b/lzwfs/lzwfs.lua
@@ -157,9 +157,11 @@ local function split(str, pattern)
 end
 
 local function matchesFilter(fname)
-    for _, filter in pairs(filters) do
-        if fname:match(filter) then
-            return true
+    if not fname:find('lzwfs') then  -- don't compress anything with lzwfs in name (sigh)
+        for _, filter in pairs(filters) do
+            if fname:match(filter) then
+                return true
+            end
         end
     end
 end
@@ -193,7 +195,7 @@ function fs.open(fname, flags)
 			end,
         }
     elseif flags == 'w' or flags == 'a' then
-        if not matchesFilter(fs.combine(fname, '')) or true then
+        if not matchesFilter(fs.combine(fname, '')) then
             return native.open(fname, flags)
         end
 
diff --git a/lzwfs/startup.lua b/lzwfs/startup.lua
index b12b64d..03a21c6 100644
--- a/lzwfs/startup.lua
+++ b/lzwfs/startup.lua
@@ -15,4 +15,4 @@ end
 
 os.run(_ENV, '/packages/lzwfs/lzwfs.lua')
 fs.option('compression', 'filters', config.filters)
-fs.option('compression', 'enable', config.enabled)
+fs.option('compression', 'enabled', config.enabled)
diff --git a/lzwfs/system/lzwfs.lua b/lzwfs/system/lzwfs.lua
index f22335c..90e2ce8 100644
--- a/lzwfs/system/lzwfs.lua
+++ b/lzwfs/system/lzwfs.lua
@@ -7,9 +7,9 @@ local fs = _G.fs
 local config = Config.load('lzwfs', {
 	enabled = false,
 	filters = {
-		'/packages',
-		'/sys',
-		'/usr/config',
+		'packages/',
+		'sys/',
+		'usr/config/',
 	}
 })
 
@@ -70,8 +70,10 @@ local function rewriteFiles(p)
 		local function recurse(path)
 			_G._syslog('rewriting: ' .. path)
 			if fs.isDir(path) then
-				for _, v in pairs(fs.list(path)) do
-					recurse(fs.combine(path, v))
+				for _, v in pairs(fs.listEx(path)) do
+					if not v.isReadOnly then
+						recurse(fs.combine(path, v.name))
+					end
 				end
 			else
 				local c = Util.readFile(path)
@@ -116,7 +118,7 @@ function tab:eventHandler(event)
 		if self.checkbox.value ~= config.enabled then
 			if not self.checkbox.value then
 				fs.option('compression', 'filters', { })
-				self:rewriteFiles(config.filters)
+				rewriteFiles(config.filters)
 				fs.option('compression', 'enabled', false)
 			else
 				fs.option('compression', 'enabled', true)