diff --git a/ChangeLog b/ChangeLog
index d5500f5d63..d917809f81 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu Feb  7 02:31:10 2013  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
+
+	* vm_insnhelper.c: attr_writer should return its argument [Bug #7773]
+
+	* test/ruby/test_basicinstructions.rb: Test for above
+
 Thu Feb  7 01:35:00 2013  Zachary Scott  <zachary@zacharyscott.net>
 
 	* doc/security.rdoc: Link to japanese version of CVE page patch by
diff --git a/test/ruby/test_basicinstructions.rb b/test/ruby/test_basicinstructions.rb
index e93b339377..4aa164e0c4 100644
--- a/test/ruby/test_basicinstructions.rb
+++ b/test/ruby/test_basicinstructions.rb
@@ -502,6 +502,7 @@ class TestBasicInstructions < Test::Unit::TestCase
 
   class OP
     attr_reader :x
+    attr_accessor :foo
     def x=(x)
       @x = x
       :Bug1996
@@ -602,6 +603,17 @@ class TestBasicInstructions < Test::Unit::TestCase
     assert_equal 4, x[0]
   end
 
+  def test_send_opassing
+    bug7773 = '[ruby-core:51821]'
+    x = OP.new
+    assert_equal 42, x.foo = 42, bug7773
+    assert_equal 42, x.foo, bug7773
+    assert_equal -6, x.send(:foo=, -6), bug7773
+    assert_equal -6, x.foo, bug7773
+    assert_equal :Bug1996, x.send(:x=, :case_when_setter_returns_other_value), bug7773
+    assert_equal :case_when_setter_returns_other_value, x.x, bug7773
+  end
+
   def test_backref
     /re/ =~ 'not match'
     assert_nil $~
@@ -683,5 +695,4 @@ class TestBasicInstructions < Test::Unit::TestCase
     assert_equal [], [*a]
     assert_equal [1], [1, *a]
   end
-
 end
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index d82ffb3d1d..636cd39c2c 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -549,7 +549,7 @@ vm_getivar(VALUE obj, ID id, IC ic, rb_call_info_t *ci, int is_attr)
     return rb_ivar_get(obj, id);
 }
 
-static inline void
+static inline VALUE
 vm_setivar(VALUE obj, ID id, VALUE val, IC ic, rb_call_info_t *ci, int is_attr)
 {
 #if USE_IC_FOR_IVAR
@@ -572,7 +572,7 @@ vm_setivar(VALUE obj, ID id, VALUE val, IC ic, rb_call_info_t *ci, int is_attr)
 
 	    if (index < len) {
 		ptr[index] = val;
-		return; /* inline cache hit */
+		return val; /* inline cache hit */
 	    }
 	}
 	else {
@@ -592,7 +592,7 @@ vm_setivar(VALUE obj, ID id, VALUE val, IC ic, rb_call_info_t *ci, int is_attr)
 	}
     }
 #endif	/* USE_IC_FOR_IVAR */
-    rb_ivar_set(obj, id, val);
+    return rb_ivar_set(obj, id, val);
 }
 
 static VALUE
@@ -1540,9 +1540,9 @@ vm_call_ivar(rb_thread_t *th, rb_control_frame_t *cfp, rb_call_info_t *ci)
 static VALUE
 vm_call_attrset(rb_thread_t *th, rb_control_frame_t *cfp, rb_call_info_t *ci)
 {
-    vm_setivar(ci->recv, ci->me->def->body.attr.id, *(cfp->sp - 1), 0, ci, 1);
+    VALUE val = vm_setivar(ci->recv, ci->me->def->body.attr.id, *(cfp->sp - 1), 0, ci, 1);
     cfp->sp -= 2;
-    return Qnil;
+    return val;
 }
 
 static inline VALUE