diff --git a/ChangeLog b/ChangeLog
index e88ab65b18..c6f1dbde85 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Feb  8 16:09:45 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* eval.c (rb_ensure): preserve errinfo accross ensure proc before
+	  JUMP_TAG().  [ruby-core:52022] [Bug #7802]
+
 Fri Feb  8 16:08:28 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* test/ruby/envutil.rb (assert_separately): check also terminating
diff --git a/eval.c b/eval.c
index c4bda48524..958daa8752 100644
--- a/eval.c
+++ b/eval.c
@@ -805,6 +805,8 @@ rb_ensure(VALUE (*b_proc)(ANYARGS), VALUE data1, VALUE (*e_proc)(ANYARGS), VALUE
 {
     int state;
     volatile VALUE result = Qnil;
+    volatile VALUE errinfo;
+    rb_thread_t *const th = GET_THREAD();
 
     PUSH_TAG();
     if ((state = EXEC_TAG()) == 0) {
@@ -813,7 +815,9 @@ rb_ensure(VALUE (*b_proc)(ANYARGS), VALUE data1, VALUE (*e_proc)(ANYARGS), VALUE
     POP_TAG();
     /* TODO: fix me */
     /* retval = prot_tag ? prot_tag->retval : Qnil; */     /* save retval */
+    errinfo = th->errinfo;
     (*e_proc) (data2);
+    th->errinfo = errinfo;
     if (state)
 	JUMP_TAG(state);
     return result;
diff --git a/ext/-test-/exception/ensured.c b/ext/-test-/exception/ensured.c
new file mode 100644
index 0000000000..365e1f4f79
--- /dev/null
+++ b/ext/-test-/exception/ensured.c
@@ -0,0 +1,25 @@
+#include <ruby.h>
+
+static VALUE
+begin(VALUE object)
+{
+    return rb_funcall(object, rb_intern("try_method"), 0);
+}
+
+static VALUE
+ensure(VALUE object)
+{
+    return rb_funcall(object, rb_intern("ensured_method"), 0);
+}
+
+static VALUE
+ensured(VALUE module, VALUE object)
+{
+    return rb_ensure(begin, object, ensure, object);
+}
+
+void
+Init_ensured(VALUE klass)
+{
+    rb_define_module_function(klass, "ensured", ensured, 1);
+}
diff --git a/test/-ext-/exception/test_ensured.rb b/test/-ext-/exception/test_ensured.rb
new file mode 100644
index 0000000000..103250c678
--- /dev/null
+++ b/test/-ext-/exception/test_ensured.rb
@@ -0,0 +1,32 @@
+require 'test/unit'
+require_relative '../../ruby/envutil'
+
+module Bug
+  class Bug7802 < RuntimeError
+  end
+
+  class TestException < Test::Unit::TestCase
+    def test_ensured
+      assert_separately([], <<-'end;') # do
+
+        require '-test-/exception'
+
+        module Bug
+          class Bug7802 < RuntimeError
+            def try_method
+              raise self
+            end
+
+            def ensured_method
+              [1].detect {|i| true}
+            end
+          end
+        end
+
+        assert_raise(Bug::Bug7802, '[ruby-core:52022] [Bug #7802]') {
+          Bug::Exception.ensured(Bug::Bug7802.new)
+        }
+      end;
+    end
+  end
+end