--- a/toolkit/components/url-classifier/SafeBrowsing.jsm
+++ b/toolkit/components/url-classifier/SafeBrowsing.jsm
@@ -300,16 +300,17 @@ this.SafeBrowsing = {
         "browser.safebrowsing.provider." + provider + ".gethashURL");
       updateURL = updateURL.replace("SAFEBROWSING_ID", clientID);
       gethashURL = gethashURL.replace("SAFEBROWSING_ID", clientID);
 
       // Disable updates and gethash if the Google API key is missing.
       let googleKey = Services.urlFormatter.formatURL("%GOOGLE_API_KEY%").trim();
       if ((provider == "google" || provider == "google4") &&
           (!googleKey || googleKey == "no-google-api-key")) {
+        log("Missing Google API key, clearing updateURL and gethashURL.");
         updateURL = "";
         gethashURL = "";
       }
 
       log("Provider: " + provider + " updateURL=" + updateURL);
       log("Provider: " + provider + " gethashURL=" + gethashURL);
 
       // Urls used to update DB