diff --git a/ChangeLog b/ChangeLog
index 277d9e5b2f..f0c11cdcd7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Dec  5 22:46:02 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* vm.c (rb_vm_make_proc): save the proc made from the given block so
+	  that it will not get collected.  [ruby-core:50545] [Bug #7507]
+
 Wed Dec  5 22:13:57 2012  Naohisa Goto  <ngotogenome@gmail.com>
 
 	* ext/dl/lib/dl/func.rb (DL::Function#bind): When Fiddle is used,
diff --git a/test/ruby/test_lazy_enumerator.rb b/test/ruby/test_lazy_enumerator.rb
index 5443bd0a3b..232e0fed3a 100644
--- a/test/ruby/test_lazy_enumerator.rb
+++ b/test/ruby/test_lazy_enumerator.rb
@@ -1,4 +1,5 @@
 require 'test/unit'
+require_relative 'envutil'
 
 class TestLazyEnumerator < Test::Unit::TestCase
   class Step
@@ -356,4 +357,10 @@ EOS
     assert_equal nil, lazy.select{}.cycle(4).size
     assert_equal nil, lazy.select{}.cycle.size
   end
+
+  def test_map_zip
+    bug7507 = '[ruby-core:50545]'
+    assert_ruby_status(["-e", "GC.stress = true", "-e", "(1..10).lazy.map{}.zip(){}"], bug7507)
+    assert_ruby_status(["-e", "GC.stress = true", "-e", "(1..10).lazy.map{}.zip().to_a"], bug7507)
+  end
 end
diff --git a/vm.c b/vm.c
index d39fe02e0c..b59044d5e4 100644
--- a/vm.c
+++ b/vm.c
@@ -477,9 +477,17 @@ vm_collect_local_variables_in_heap(rb_thread_t *th, VALUE *ep, VALUE ary)
 
 static void vm_rewrite_ep_in_errinfo(rb_thread_t *th);
 static VALUE vm_make_proc_from_block(rb_thread_t *th, rb_block_t *block);
+static VALUE vm_make_env_object(rb_thread_t * th, rb_control_frame_t *cfp, VALUE *blockprocptr);
 
 VALUE
 rb_vm_make_env_object(rb_thread_t * th, rb_control_frame_t *cfp)
+{
+    VALUE blockprocval;
+    return vm_make_env_object(th, cfp, &blockprocval);
+}
+
+static VALUE
+vm_make_env_object(rb_thread_t *th, rb_control_frame_t *cfp, VALUE *blockprocptr)
 {
     VALUE envval;
     VALUE *lep = VM_CF_LEP(cfp);
@@ -490,6 +498,7 @@ rb_vm_make_env_object(rb_thread_t * th, rb_control_frame_t *cfp)
 	rb_proc_t *p;
 	GetProcPtr(blockprocval, p);
 	lep[0] = VM_ENVVAL_BLOCK_PTR(&p->block);
+	*blockprocptr = blockprocval;
     }
 
     envval = vm_make_env_each(th, cfp, cfp->ep, lep);
@@ -560,7 +569,7 @@ rb_vm_make_proc(rb_thread_t *th, const rb_block_t *block, VALUE klass)
 	rb_bug("rb_vm_make_proc: Proc value is already created.");
     }
 
-    envval = rb_vm_make_env_object(th, cfp);
+    envval = vm_make_env_object(th, cfp, &blockprocval);
 
     if (PROCDEBUG) {
 	check_env_value(envval);