diff --git a/browser/app/profile/firefox.js b/browser/app/profile/firefox.js
index 1f899a036455..0a49b425fe1d 100644
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -368,6 +368,11 @@ pref("browser.search.update.interval", 21600);
 // enable search suggestions by default
 pref("browser.search.suggest.enabled", true);
 
+#ifdef MOZ_OFFICIAL_BRANDING
+// {moz:official} expands to "official"
+pref("browser.search.official", true);
+#endif
+
 pref("browser.sessionhistory.max_entries", 50);
 
 // handle links targeting new windows
diff --git a/mobile/android/app/mobile.js b/mobile/android/app/mobile.js
index 126e46953bb2..89ffe8950d60 100644
--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -262,6 +262,11 @@ pref("browser.search.jarURIs", "chrome://browser/locale/searchplugins/");
 // tell the search service that we don't really expose the "current engine"
 pref("browser.search.noCurrentEngine", true);
 
+#ifdef MOZ_OFFICIAL_BRANDING
+// {moz:official} expands to "official"
+pref("browser.search.official", true);
+#endif
+
 // enable xul error pages
 pref("browser.xul.error_pages.enabled", true);
 
diff --git a/mobile/xul/app/mobile.js b/mobile/xul/app/mobile.js
index 81e3639da099..494f594f66b9 100644
--- a/mobile/xul/app/mobile.js
+++ b/mobile/xul/app/mobile.js
@@ -256,6 +256,11 @@ pref("browser.search.jarURIs", "chrome://browser/locale/searchplugins/");
 // tell the search service that we don't really expose the "current engine"
 pref("browser.search.noCurrentEngine", true);
 
+#ifdef MOZ_OFFICIAL_BRANDING
+// {moz:official} expands to "official"
+pref("browser.search.official", true);
+#endif
+
 // enable xul error pages
 pref("browser.xul.error_pages.enabled", true);
 
diff --git a/toolkit/components/search/nsSearchService.js b/toolkit/components/search/nsSearchService.js
index cc23ca83e7e6..3d0b9980619a 100644
--- a/toolkit/components/search/nsSearchService.js
+++ b/toolkit/components/search/nsSearchService.js
@@ -803,13 +803,21 @@ function ParamSubstitution(aParamValue, aSearchTerms, aEngine) {
     distributionID = Services.prefs.getCharPref(BROWSER_SEARCH_PREF + "distributionID");
   }
   catch (ex) { }
+  var official = MOZ_OFFICIAL;
+  try {
+    if (Services.prefs.getBoolPref(BROWSER_SEARCH_PREF + "official"))
+      official = "official";
+    else
+      official = "unofficial";
+  }
+  catch (ex) { }
 
   // Custom search parameters. These are only available to default search
   // engines.
   if (aEngine._isDefault) {
     value = value.replace(MOZ_PARAM_LOCALE, getLocale());
     value = value.replace(MOZ_PARAM_DIST_ID, distributionID);
-    value = value.replace(MOZ_PARAM_OFFICIAL, MOZ_OFFICIAL);
+    value = value.replace(MOZ_PARAM_OFFICIAL, official);
   }
 
   // Insert the OpenSearch parameters we're confident about