diff --git a/src/Hakyll/Web/CompressCss.hs b/src/Hakyll/Web/CompressCss.hs
index ce7239f..c00b5ee 100644
--- a/src/Hakyll/Web/CompressCss.hs
+++ b/src/Hakyll/Web/CompressCss.hs
@@ -37,11 +37,17 @@ compressSeparators [] = []
 compressSeparators str
     | isPrefixOf "\"" str = head str : retainConstants compressSeparators "\"" (drop 1 str)
     | isPrefixOf "'" str = head str : retainConstants compressSeparators "'" (drop 1 str)
-    | otherwise =
-        replaceAll "; *}" (const "}") $
-        replaceAll " *([{};]) *" (take 1 . dropWhile isSpace) $
-        replaceAll ";+" (const ";") str
-  where
+    | isPrefixOf "  " str = compressSeparators (drop 1 str)
+    | isPrefixOf " {" str = compressSeparators (drop 1 str)
+    | isPrefixOf " }" str = compressSeparators (drop 1 str)
+    | isPrefixOf " ;" str = compressSeparators (drop 1 str)
+    | isPrefixOf ";;" str = compressSeparators (drop 1 str)
+    | isPrefixOf "{ " str = compressSeparators (head str : (drop 2 str))
+    | isPrefixOf "} " str = compressSeparators (head str : (drop 2 str))
+    | isPrefixOf "; " str = compressSeparators (head str : (drop 2 str))
+    | isPrefixOf ";}" str = '}' : compressSeparators (drop 2 str)
+    | otherwise = head str : compressSeparators (drop 1 str)
+
 
 --------------------------------------------------------------------------------
 -- | Compresses all whitespace.
diff --git a/tests/Hakyll/Web/CompressCss/Tests.hs b/tests/Hakyll/Web/CompressCss/Tests.hs
index c8db116..44dfc6c 100644
--- a/tests/Hakyll/Web/CompressCss/Tests.hs
+++ b/tests/Hakyll/Web/CompressCss/Tests.hs
@@ -46,11 +46,13 @@ tests = testGroup "Hakyll.Web.CompressCss.Tests" $ concat
             compressCss "\"   '   \""
         , "'   \"   '" @=?
             compressCss "'   \"   '"
+          -- don't compress whitespace in constants in the middle of a string
+        , "abc '{ '" @=?
+            compressCss "abc '{ '"
+        , "abc \"{ \"" @=?
+            compressCss "abc \"{ \""
+          -- compress multiple semicolons
         , ";" @=?
             compressCss ";;;;;;;"
-
-          -- some real-life css
-        , "a:after{content: \" (\" attr(href) \")\"}" @=?
-            compressCss "a:after {  content: \" (\" attr(href) \")\"; }"
         ]
     ]