diff --git a/lib/rake/task_manager.rb b/lib/rake/task_manager.rb
index 0db5c241e..74accd03b 100644
--- a/lib/rake/task_manager.rb
+++ b/lib/rake/task_manager.rb
@@ -302,6 +302,8 @@ def make_sources(task_name, task_pattern, extensions)
           source == ext ? task_name.ext(ext) : source
         when String, Symbol
           ext.to_s
+        when Pathname
+          Rake.from_pathname(ext)
         when Proc, Method
           if ext.arity == 1
             ext.call(task_name)
diff --git a/test/test_rake_rules.rb b/test/test_rake_rules.rb
index e20df9350..48fab0bad 100644
--- a/test/test_rake_rules.rb
+++ b/test/test_rake_rules.rb
@@ -80,6 +80,16 @@ def test_rule_prereqs_can_be_created_by_string
     assert_equal [OBJFILE], @runs
   end
 
+  def test_rule_prereqs_can_be_created_by_pathname
+    create_file(SRCFILE)
+    create_file(FOOFILE)
+    rule ".o" => [".c", Pathname(FOOFILE)] do |t|
+      @runs << t.name
+    end
+    Task[OBJFILE].invoke
+    assert_equal [OBJFILE], @runs
+  end
+
   def test_rule_prereqs_can_be_created_by_symbol
     task :nonfile do |t|
       @runs << t.name