diff --git a/js/id/util.js b/js/id/util.js
index fd5604013..ea478b7f8 100644
--- a/js/id/util.js
+++ b/js/id/util.js
@@ -57,13 +57,19 @@ iD.util.qsString = function(obj) {
 };
 
 iD.util.prefixProperty = function(property) {
-    var prefixes = ['webkit', 'ms', 'Moz', 'O'];
-    return (function prefixMatch(p) { // via mbostock
-        var i = -1, n = p.length, s = document.body.style;
-        if (property.toLowerCase() in s) return property.toLowerCase();
-        while (++i < n) if (p[i] + property in s) return '-' + p[i].toLowerCase() + '-' + property.toLowerCase();
-        return false;
-    })(prefixes);
+    var prefixes = ['webkit', 'ms', 'Moz', 'O'],
+        i = -1,
+        n = prefixes.length,
+        s = document.body.style;
+
+    if (property.toLowerCase() in s)
+        return property.toLowerCase();
+
+    while (++i < n)
+        if (prefixes[i] + property in s)
+            return '-' + prefixes[i].toLowerCase() + '-' + property.toLowerCase();
+
+    return false;
 };
 
 iD.util.support3d = function() {