diff -r d68a4ae37f4a -r f3a458479f9c plugins/xkcd2.lua
--- a/plugins/xkcd2.lua	Thu Jul 09 14:34:36 2015 +0200
+++ b/plugins/xkcd2.lua	Thu Jul 09 14:38:17 2015 +0200
@@ -17,7 +17,7 @@
 		local strip;
 
 		if q then
-			local t, num = q:match("^([#\"]?)(%d+)\"?$");
+			local t, num = q:match("^([#\"]?)(%-?%d+)\"?$");
 			if t ~= '"' then
 				num = tonumber(num);
 				if num and num < 0 then