diff --git a/platform/safari/vapi-client.js b/platform/safari/vapi-client.js
index 99811cd90209b..6a871579be830 100644
--- a/platform/safari/vapi-client.js
+++ b/platform/safari/vapi-client.js
@@ -50,19 +50,21 @@ if ( /^image\/|^text\/plain/.test(contentType) ) {
 
 var vAPI = self.vAPI = self.vAPI || {};
 
+// https://github.com/chrisaljoudi/uBlock/issues/456
+// Already injected?
+if ( vAPI.sessionId ) {
+    return;
+}
+
 var safari;
 if ( typeof self.safari === 'undefined' ) {
     safari = self.top.safari;
+    // https://github.com/el1t/uBlock-Safari/issues/23
+    self.safari = safari;
 } else {
     safari = self.safari;
 }
 
-// https://github.com/chrisaljoudi/uBlock/issues/456
-// Already injected?
-if ( vAPI.sessionId ) {
-    return;
-}
-
 /******************************************************************************/
 
 vAPI.randomToken = function() {