AceAddon-3.1 How did that get there?

diff --git a/Interface/Common.lua b/Interface/Common.lua
index d0f2671..28952a3 100644
--- a/Interface/Common.lua
+++ b/Interface/Common.lua
@@ -12,7 +12,7 @@ local string = _G.string
 local LibStub = LibStub

 local MODNAME	= "Ackis Recipe List"
-local addon	= LibStub("AceAddon-3.1"):GetAddon(MODNAME)
+local addon	= LibStub("AceAddon-3.0"):GetAddon(MODNAME)

 -- Set up the private intra-file namespace.
 local private	= select(2, ...)