diff --git a/clay.cabal b/clay.cabal
--- a/clay.cabal
+++ b/clay.cabal
@@ -1,5 +1,5 @@
 Name:     clay
-Version:  0.12.1
+Version:  0.12.2
 Synopsis: CSS preprocessor as embedded Haskell.
 Description:
   Clay is a CSS preprocessor like LESS and Sass, but implemented as an embedded
@@ -83,5 +83,5 @@
     mtl                  >= 1     && < 2.3,
     text                 >= 0.11  && < 1.3,
     hspec-expectations   >= 0.7.2 && < 0.9,
-    hspec                >= 2.2.0 && < 2.3
+    hspec                >= 2.2.0 && < 2.5
   Ghc-Options: -Wall
diff --git a/src/Clay/Display.hs b/src/Clay/Display.hs
--- a/src/Clay/Display.hs
+++ b/src/Clay/Display.hs
@@ -272,8 +272,8 @@
 nResize = CursorValue "n-resize"
 seResize = CursorValue "se-resize"
 swResize = CursorValue "sw-resize"
-sResize = CursorValue "sResize"
-wResize = CursorValue "sResize"
+sResize = CursorValue "s-resize"
+wResize = CursorValue "w-resize"
 cursorText = CursorValue "text"
 wait = CursorValue "wait"
 cursorProgress = CursorValue "progress"
diff --git a/src/Clay/Selector.hs b/src/Clay/Selector.hs
--- a/src/Clay/Selector.hs
+++ b/src/Clay/Selector.hs
@@ -6,6 +6,7 @@
   , UndecidableInstances
   , ViewPatterns
   , PatternGuards
+  , CPP
   #-}
 module Clay.Selector where
 
@@ -15,6 +16,10 @@
 import Data.Text (Text)
 import Prelude hiding (foldl)
 
+#if MIN_VERSION_base(4,9,0)
+import Data.Semigroup
+#endif
+
 import qualified Data.Text as Text
 
 -- | The star selector applies to all elements. Maps to @*@ in CSS.
@@ -133,6 +138,7 @@
 (|=) :: Text -> Text -> Refinement
 (|=) a = Refinement . pure . AttrHyph a
 
+
 -------------------------------------------------------------------------------
 
 data Predicate
@@ -197,6 +203,11 @@
     Just ('#', s) -> SelectorF (Refinement [Id s]) Star
     Just ('.', s) -> SelectorF (Refinement [Class s]) Star
     _             -> SelectorF (Refinement []) (Elem t)
+
+#if MIN_VERSION_base(4,9,0)
+instance Semigroup (Fix SelectorF) where
+  (<>) = mappend
+#endif
 
 instance Monoid (Fix SelectorF) where
   mempty      = error "Selector is a semigroup"