diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,6 +1,10 @@
+### 3.0.27
+
++ Mark the 'length' argument of [builderAddFromString](https://hackage.haskell.org/package/gi-gtk-3.0.27/docs/GI-Gtk-Objects-Builder.html#v:builderAddFromString) is marked as signed, so '(-1)' can be passed without a warning. See [issue 209](https://github.com/haskell-gi/haskell-gi/issues/209).
+
 ### 3.0.26
 
-+ Make sure that the @data@ argument of [CellLayoutDataFunc](https://hackage.haskell.org/package/gi-gtk/docs/GI-Gtk-Callbacks.html#t:CellLayoutDataFunc) is properly anotated as a closure argument.
++ Make sure that the 'data' argument of [CellLayoutDataFunc](https://hackage.haskell.org/package/gi-gtk/docs/GI-Gtk-Callbacks.html#t:CellLayoutDataFunc) is properly anotated as a closure argument.
 
 ### 3.0.25
 
diff --git a/Gtk.overrides b/Gtk.overrides
--- a/Gtk.overrides
+++ b/Gtk.overrides
@@ -89,6 +89,9 @@
 # https://github.com/haskell-gi/haskell-gi/issues/148
 set-attr cairo/FontOptions glib:get-type cairo_gobject_font_options_get_type
 
+# Marked as gsize, which is unsigned, but the function accepts (-1)
+set-attr Gtk/Builder/add_from_string/@parameters/length/@type name gssize
+
 # Generated from gtk+ 3.22.11 with xsltproc Nullable.xslt Gtk-3.0.gir
 set-attr Gtk/AboutDialog/set_comments/@parameters/comments nullable 1
 set-attr Gtk/AboutDialog/set_copyright/@parameters/copyright nullable 1
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Documentation
 Autogenerated documentation for this package can be found at
 
-[https://hackage.haskell.org/package/gi-gtk-3.0.26/docs/GI-Gtk.html](https://hackage.haskell.org/package/gi-gtk-3.0.26/docs/GI-Gtk.html)
+[https://hackage.haskell.org/package/gi-gtk-3.0.27/docs/GI-Gtk.html](https://hackage.haskell.org/package/gi-gtk-3.0.27/docs/GI-Gtk.html)
 
 For general documentation on using [haskell-gi](https://github.com/haskell-gi/haskell-gi) based bindings, see [the project page](https://github.com/haskell-gi/haskell-gi) or [the Wiki](https://github.com/haskell-gi/haskell-gi/wiki).
diff --git a/gi-gtk.cabal b/gi-gtk.cabal
--- a/gi-gtk.cabal
+++ b/gi-gtk.cabal
@@ -1,12 +1,12 @@
 name:                 gi-gtk
-version:              3.0.26
+version:              3.0.27
 synopsis:             Gtk bindings
 description:          Bindings for Gtk, autogenerated by haskell-gi.
 homepage:             https://github.com/haskell-gi/haskell-gi
 license:              LGPL-2.1
 license-file:         LICENSE
 author:               Will Thompson, Iñaki García Etxebarria and Jonas Platte
-maintainer:           Iñaki García Etxebarria (garetxe@gmail.com)
+maintainer:           Iñaki García Etxebarria (inaki@blueleaf.cc)
 category:             Bindings
 build-type:           Custom
 cabal-version:        1.24