diff --git a/toolkit/components/places/tests/autocomplete/head_autocomplete.js b/toolkit/components/places/tests/autocomplete/head_autocomplete.js
index 17da7eef4e84..ea6b616e6450 100644
--- a/toolkit/components/places/tests/autocomplete/head_autocomplete.js
+++ b/toolkit/components/places/tests/autocomplete/head_autocomplete.js
@@ -206,6 +206,7 @@ function run_test() {
   print("\n");
   // always search in history + bookmarks, no matter what the default is
   prefs.setIntPref("browser.urlbar.search.sources", 3);
+  prefs.setIntPref("browser.urlbar.default.behavior", 0);
 
   // Search is asynchronous, so don't let the test finish immediately
   do_test_pending();
diff --git a/toolkit/components/places/tests/unit/test_000_frecency.js b/toolkit/components/places/tests/unit/test_000_frecency.js
index 1eeabc6301f6..defdf186fdae 100644
--- a/toolkit/components/places/tests/unit/test_000_frecency.js
+++ b/toolkit/components/places/tests/unit/test_000_frecency.js
@@ -247,6 +247,7 @@ function run_test() {
 
   // always search in history + bookmarks, no matter what the default is
   prefs.setIntPref("browser.urlbar.search.sources", 3);
+  prefs.setIntPref("browser.urlbar.default.behavior", 0);
 
   // Search is asynchronous, so don't let the test finish immediately
   do_test_pending();
diff --git a/toolkit/components/places/tests/unit/test_408221.js b/toolkit/components/places/tests/unit/test_408221.js
index 8730af55fe2d..33b60ce92e8c 100755
--- a/toolkit/components/places/tests/unit/test_408221.js
+++ b/toolkit/components/places/tests/unit/test_408221.js
@@ -167,6 +167,7 @@ function run_test() {
   var prefs = Cc["@mozilla.org/preferences-service;1"].
               getService(Ci.nsIPrefBranch);
   prefs.setIntPref("browser.urlbar.search.sources", 3);
+  prefs.setIntPref("browser.urlbar.default.behavior", 0);
 
   tagssvc.tagURI(uri1, ["Foo"]);
   tagssvc.tagURI(uri2, ["FOO"]);
diff --git a/toolkit/components/places/tests/unit/test_history_autocomplete_tags.js b/toolkit/components/places/tests/unit/test_history_autocomplete_tags.js
index 10841c89c9fe..cc00e3c2961d 100755
--- a/toolkit/components/places/tests/unit/test_history_autocomplete_tags.js
+++ b/toolkit/components/places/tests/unit/test_history_autocomplete_tags.js
@@ -190,6 +190,7 @@ function run_test() {
   var prefs = Cc["@mozilla.org/preferences-service;1"].
               getService(Ci.nsIPrefBranch);
   prefs.setIntPref("browser.urlbar.search.sources", 3);
+  prefs.setIntPref("browser.urlbar.default.behavior", 0);
 
   tagssvc.tagURI(uri1, ["foo"]);
   tagssvc.tagURI(uri2, ["bar"]);