diff --git a/generator/Data/XCB/Python/Parse.hs b/generator/Data/XCB/Python/Parse.hs
--- a/generator/Data/XCB/Python/Parse.hs
+++ b/generator/Data/XCB/Python/Parse.hs
@@ -488,7 +488,7 @@
 
       mkBasePack (Nothing, "") = []
       mkBasePack (n, c) =
-        let n' = maybe "" id n
+        let n' = maybe "_" id n
         in [(n', Left (Just (mkCall "struct.pack" [mkStr ('=' : c), mkName n'])))]
 
 mkPackMethod :: String
diff --git a/xcffib.cabal b/xcffib.cabal
--- a/xcffib.cabal
+++ b/xcffib.cabal
@@ -1,5 +1,5 @@
 name:                xcffib
-version:             1.1.0
+version:             1.1.1
 synopsis:            A cffi-based python binding for X
 homepage:            http://github.com/tych0/xcffib
 license:             OtherLicense