diff --git a/ChangeLog b/ChangeLog
index 9b3790b41c..1fc0a9efb0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Sep 21 13:38:44 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y: `do` after cmdarg in parentheses should be `do_block`
+	  and bound to the outer method.  [ruby-core:72482] [Bug #11873]
+
 Wed Sep 21 13:32:00 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (brace_body, do_body): extract block bodies.
diff --git a/parse.y b/parse.y
index aa32872ae6..1b6dcb9e37 100644
--- a/parse.y
+++ b/parse.y
@@ -7911,7 +7911,7 @@ parse_ident(struct parser_params *parser, int c, int cmd_state)
 		if (COND_P()) return keyword_do_cond;
 		if (CMDARG_P() && !IS_lex_state_for(state, EXPR_CMDARG))
 		    return keyword_do_block;
-		if (IS_lex_state_for(state, (EXPR_BEG | EXPR_ENDARG)))
+		if (IS_lex_state_for(state, (EXPR_BEG | EXPR_END | EXPR_ENDARG)))
 		    return keyword_do_block;
 		return keyword_do;
 	    }
diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index c135cec4ea..965ef3e577 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -832,6 +832,14 @@ eom
     assert_valid_syntax("foo (bar rescue nil)")
   end
 
+  def test_cmdarg_in_paren
+    bug11873 = '[ruby-core:72482] [Bug #11873]'
+    assert_valid_syntax %q{a b{c d}, :e do end}, bug11873
+    assert_valid_syntax %q{a b(c d), :e do end}, bug11873
+    assert_valid_syntax %q{a b{c(d)}, :e do end}, bug11873
+    assert_valid_syntax %q{a b(c(d)), :e do end}, bug11873
+  end
+
   private
 
   def not_label(x) @result = x; @not_label ||= nil end