diff --git a/keera-hails-reactive-gtk.cabal b/keera-hails-reactive-gtk.cabal
--- a/keera-hails-reactive-gtk.cabal
+++ b/keera-hails-reactive-gtk.cabal
@@ -6,7 +6,7 @@
 build-type:    Simple
 
 name:          keera-hails-reactive-gtk
-version:       0.7.0
+version:       0.8.0
 author:        Ivan Perez
 maintainer:    support@keera.co.uk
 homepage:      http://www.keera.co.uk/blog/community/
@@ -72,7 +72,7 @@
     Graphics.UI.Gtk.Reactive.Window
 
   build-depends:
-      base >= 4 && < 5
+      base         >= 4 && < 5
     , bytestring
     , mtl
     , transformers
@@ -111,8 +111,8 @@
     buildable: False
   else
     build-depends:
-        base
-      , hlint                >= 1.7
+        base  >= 4   && < 5
+      , hlint >= 1.7
 
 -- Verify that the code is thoroughly documented
 test-suite haddock-coverage
@@ -136,7 +136,7 @@
     buildable: False
   else
     build-depends:
-        base                 >= 4        && < 5
+        base        >= 4 && < 5
       , directory
       , filepath
       , process
diff --git a/src/Graphics/UI/Gtk/Reactive/Property.hs b/src/Graphics/UI/Gtk/Reactive/Property.hs
--- a/src/Graphics/UI/Gtk/Reactive/Property.hs
+++ b/src/Graphics/UI/Gtk/Reactive/Property.hs
@@ -126,10 +126,10 @@
                  => self
                  -> (self -> b -> IO ()) -> (self -> IO b)
                  -> ReactiveFieldReadWrite IO b
-passivePropertyGE e set get =
+passivePropertyGE e set' get' =
   ReactiveFieldReadWrite setter getter notifier
- where getter     = get e
+ where getter     = get' e
        setter v   = postGUIAsync $ do
                       p <- getter
-                      when (p /= v) $ set e v
+                      when (p /= v) $ set' e v
        notifier _ = return ()