diff --git a/init.lua b/init.lua
index 544075b..2215e5e 100644
--- a/init.lua
+++ b/init.lua
@@ -63,7 +63,7 @@ i3 = {
 		caches = lf"/src/caches.lua",
 		callbacks = lf"/src/callbacks.lua",
 		common = lf"/src/common.lua",
-		compress = lf"/src/compress.lua",
+		compress = lf"/src/compression.lua",
 		detached = lf"/src/detached_inv.lua",
 		fields = lf"/src/fields.lua",
 		groups = lf"/src/groups.lua",
diff --git a/src/compress.lua b/src/compression.lua
similarity index 100%
rename from src/compress.lua
rename to src/compression.lua
diff --git a/src/preprocessor.lua b/src/preprocessor.lua
index 406c9cd..a75ad39 100644
--- a/src/preprocessor.lua
+++ b/src/preprocessor.lua
@@ -51,6 +51,10 @@ local function compile(data)
 		end
 	end)
 
+	data = data:gsub("([%w_]+)-%-\n", function(a)
+		return fmt("%s = %s - 1", a, a)
+	end)
+
 	for op, func in pairs(operators) do
 		data = data:gsub("(" .. var .. "+)%s?" .. op .. "%s?(" .. var .. "*)", func)
 	end
diff --git a/util/luacheck.lua b/util/luacheck.lua
index 552c4bd..289bd5d 100755
--- a/util/luacheck.lua
+++ b/util/luacheck.lua
@@ -35,7 +35,7 @@ local files = {
 	"caches",
 	"callbacks",
 	"common",
-	"compress",
+	"compression",
 	"detached_inv",
 	"fields",
 	"groups",
@@ -91,6 +91,10 @@ local function compile(data)
 		end
 	end)
 
+	data = data:gsub("([%w_]+)-%-\n", function(a)
+		return fmt("%s = %s - 1", a, a)
+	end)
+
 	for op, func in pairs(operators) do
 		data = data:gsub("(" .. var .. "+)%s?" .. op .. "%s?(" .. var .. "*)", func)
 	end
@@ -123,7 +127,7 @@ for _, p in ipairs(files) do
 			end
 		end
 
-		local _file = io.open(path:match("(.*)%.") .. ".l", "w")
+		local _file = io.open(path:match("(.*)%.") .. ".lc", "w")
 		_file:write(data)
 		_file:close()
 	end
@@ -133,5 +137,5 @@ end
 
 exec "luacheck ../init.lua"
 exec "luacheck ../src/preprocessor.lua"
-exec "luacheck ../src/*.l"
-exec "rm ../src/*.l"
+exec "luacheck ../src/*.lc"
+exec "rm ../src/*.lc"