diff --git a/parse.y b/parse.y
index 85cbc37331..8a800bbd50 100644
--- a/parse.y
+++ b/parse.y
@@ -3762,7 +3762,7 @@ brace_body	: {$<vars>$ = dyna_push();}
 		;
 
 do_body 	: {$<vars>$ = dyna_push();}
-		  {$<val>$ = cmdarg_stack >> 1; CMDARG_SET(0);}
+		  {$<val>$ = cmdarg_stack; CMDARG_SET(0);}
 		  opt_block_param compstmt
 		    {
 			$$ = new_do_body($3, $4);
diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 3e6212e27c..f40f15316b 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -917,6 +917,15 @@ eom
     end
   end
 
+  def test_do_block_in_hash_brace
+    bug13073 = '[ruby-core:78837] [Bug #13073]'
+    assert_valid_syntax 'p :foo, {a: proc do end, b: proc do end}', bug13073
+    assert_valid_syntax 'p :foo, {:a => proc do end, b: proc do end}', bug13073
+    assert_valid_syntax 'p :foo, {"a": proc do end, b: proc do end}', bug13073
+    assert_valid_syntax 'p :foo, {** proc do end, b: proc do end}', bug13073
+    assert_valid_syntax 'p :foo, {proc do end => proc do end, b: proc do end}', bug13073
+  end
+
   def test_do_after_local_variable
     obj = Object.new
     def obj.m; yield; end
diff --git a/version.h b/version.h
index 2e2d074a4e..afefdc7510 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.4.0"
 #define RUBY_RELEASE_DATE "2017-03-11"
-#define RUBY_PATCHLEVEL 5
+#define RUBY_PATCHLEVEL 6
 
 #define RUBY_RELEASE_YEAR 2017
 #define RUBY_RELEASE_MONTH 3