diff --git a/toolkit/content/tests/chrome/test_autocomplete2.xul b/toolkit/content/tests/chrome/test_autocomplete2.xul
index eac4c64f2c2c..46f4f3239bb8 100644
--- a/toolkit/content/tests/chrome/test_autocomplete2.xul
+++ b/toolkit/content/tests/chrome/test_autocomplete2.xul
@@ -46,6 +46,7 @@ nsAutoCompleteSimpleResult.prototype = {
  getCommentAt: function() { return null; },
  getStyleAt: function() { return null; },
  getImageAt: function() { return null; },
+ getLabelAt: function() { return null; },
  removeValueAt: function() {}
 };
 
diff --git a/toolkit/content/tests/chrome/test_autocomplete3.xul b/toolkit/content/tests/chrome/test_autocomplete3.xul
index 5df235181e82..61bf3dc2b2be 100644
--- a/toolkit/content/tests/chrome/test_autocomplete3.xul
+++ b/toolkit/content/tests/chrome/test_autocomplete3.xul
@@ -46,6 +46,7 @@ nsAutoCompleteSimpleResult.prototype = {
  getCommentAt: function() { return null; },
  getStyleAt: function() { return null; },
  getImageAt: function() { return null; },
+ getLabelAt: function() { return null; },
  removeValueAt: function() {}
 };
 
diff --git a/toolkit/content/tests/chrome/test_autocomplete4.xul b/toolkit/content/tests/chrome/test_autocomplete4.xul
index 91b3fdaa7540..92ea53fb4572 100644
--- a/toolkit/content/tests/chrome/test_autocomplete4.xul
+++ b/toolkit/content/tests/chrome/test_autocomplete4.xul
@@ -48,6 +48,7 @@ nsAutoCompleteSimpleResult.prototype = {
  getCommentAt: function() { return null; },
  getStyleAt: function() { return null; },
  getImageAt: function() { return null; },
+ getLabelAt: function() { return null; },
  removeValueAt: function() {}
 };