diff --git a/minify.lua b/minify.lua
index 41d7a60..972d66f 100644
--- a/minify.lua
+++ b/minify.lua
@@ -324,8 +324,7 @@ function CreateLuaTokenStream(text)
 				local c2 = get()
 				if c2 == '\\' then
 					local c3 = get()
-					local esc = CharacterForEscape[c3]
-					if not esc then
+					if not(Digits[c3] or CharacterForEscape[c3]) then
 						error("Invalid Escape Sequence `"..c3.."`.")
 					end
 				elseif c2 == c1 then