diff --git a/lib/brakeman/checks/check_mass_assignment.rb b/lib/brakeman/checks/check_mass_assignment.rb
index b0770180f078861abb8a37ae56a7e4a06f7f7d2d..115ceb13dc65596512be9654eded1aa7a48a3668 100644
--- a/lib/brakeman/checks/check_mass_assignment.rb
+++ b/lib/brakeman/checks/check_mass_assignment.rb
@@ -59,7 +59,11 @@ class Brakeman::CheckMassAssignment < Brakeman::BaseCheck
       if attr_protected and tracker.options[:ignore_attr_protected]
         return
       elsif input = include_user_input?(call.arglist)
-        if not hash? call.first_arg and not attr_protected
+        first_arg = call.first_arg
+
+        if call? first_arg and (first_arg.method == :slice or first_arg.method == :only)
+          return
+        elsif not node_type? first_arg, :hash and not attr_protected
           confidence = CONFIDENCE[:high]
           user_input = input.match
         else
diff --git a/test/tests/test_rails3.rb b/test/tests/test_rails3.rb
index 329d0469236973976ff5c17644342e06a4f6590d..01a8989cf10b49f0fa65f52b5cd3e0de9a117974 100644
--- a/test/tests/test_rails3.rb
+++ b/test/tests/test_rails3.rb
@@ -674,6 +674,24 @@ class Rails3Tests < Test::Unit::TestCase
       :file => /home_controller\.rb/
   end
 
+  def test_mass_assignment_with_slice
+    assert_no_warning :type => :warning,
+      :warning_type => "Mass Assignment",
+      :line => 141,
+      :message => /^Unprotected\ mass\ assignment/,
+      :confidence => 0,
+      :file => /home_controller\.rb/
+  end
+
+  def test_mass_assignment_with_only
+    assert_no_warning :type => :warning,
+      :warning_type => "Mass Assignment",
+      :line => 142,
+      :message => /^Unprotected\ mass\ assignment/,
+      :confidence => 0,
+      :file => /home_controller\.rb/
+  end
+
   def test_translate_bug
     assert_warning :type => :warning,
       :warning_type => "Cross Site Scripting",