diff --git a/spec/Clay/MediaSpec.hs b/spec/Clay/MediaSpec.hs
index ecffbe4..0cc353b 100644
--- a/spec/Clay/MediaSpec.hs
+++ b/spec/Clay/MediaSpec.hs
@@ -2,9 +2,9 @@
 
 module Clay.MediaSpec (spec) where
 
-import Clay (Css, em, query)
+import Clay (compact, Css, em, opacity, query, renderWith)
 import Clay.Media
-import Clay.Stylesheet (Feature, MediaType)
+import Clay.Stylesheet (Feature, keyframes, MediaType)
 import Common
 import Data.Text.Lazy (Text, unpack)
 import Test.Hspec
@@ -73,6 +73,15 @@ spec = do
     "prefers-color-scheme: light" `shouldRenderFromFeature` prefersColorScheme light
     "prefers-color-scheme: dark" `shouldRenderFromFeature` prefersColorScheme dark
 
+  describe "keyframes tests" $ do
+    it "keyframes test 1" $
+      (renderWith compact [] $ keyframes "blink-animation" [(0, opacity 0), (100, opacity 1)])
+        `shouldBe` ("@-webkit-keyframes blink-animation{0% {opacity:0}100% {opacity:1}}" <>
+                    "@-moz-keyframes blink-animation{0% {opacity:0}100% {opacity:1}}" <>
+                    "@-ms-keyframes blink-animation{0% {opacity:0}100% {opacity:1}}" <>
+                    "@-o-keyframes blink-animation{0% {opacity:0}100% {opacity:1}}" <>
+                    "@keyframes blink-animation{0% {opacity:0}100% {opacity:1}}")
+
 -- | Empty CSS for when CSS is needed but we don't care about it.
 emptyStyle :: Css
 emptyStyle = pure ()
diff --git a/src/Clay/Render.hs b/src/Clay/Render.hs
index a855287..7adc1a8 100644
--- a/src/Clay/Render.hs
+++ b/src/Clay/Render.hs
@@ -16,7 +16,7 @@ import           Control.Applicative
 import           Control.Monad.Writer
 import           Data.List              (sort)
 import           Data.Maybe
-import           Data.Text              (Text, pack)
+import           Data.Text              (Text)
 import           Data.Text.Lazy.Builder
 import           Prelude                hiding ((**))
 
@@ -150,7 +150,7 @@ kframe cfg (Keyframes ident xs) =
 frame :: Config -> (Number, [Rule]) -> Builder
 frame cfg (p, rs) =
   mconcat
-    [ fromText (pack (show p))
+    [ fromText (cssNumberText p)
     , "% "
     , rules cfg [] rs
     ]