diff --git a/prefixfree.js b/prefixfree.js
index 2e5685f7..6ba4ac9c 100755
--- a/prefixfree.js
+++ b/prefixfree.js
@@ -224,7 +224,7 @@ var self = window.PrefixFree = {
 		if (self.properties.length) {
 			var regex = RegExp('\\b(' + self.properties.join('|') + ')(?!:)', 'gi');
 
-			css = fix('valueProperties', '\\b', ':(.+?);', function($0) {
+			css = fix('valueProperties', '\\b', '\\s*:([^;}]+?)[;}]', function($0) {
 				return $0.replace(regex, prefix + "$1")
 			}, css);
 		}