diff --git a/parse.y b/parse.y
index b0738737cd..2b5a692558 100644
--- a/parse.y
+++ b/parse.y
@@ -10684,12 +10684,13 @@ reg_named_capture_assign_iter(const OnigUChar *name, const OnigUChar *name_end,
     NODE *node, *succ;
 
     if (!len) return ST_CONTINUE;
-    if (len < MAX_WORD_LENGTH && rb_reserved_word(s, (int)len))
-        return ST_CONTINUE;
     if (rb_enc_symname_type(s, len, enc, (1U<<ID_LOCAL)) != ID_LOCAL)
         return ST_CONTINUE;
 
     var = intern_cstr(s, len, enc);
+    if (len < MAX_WORD_LENGTH && rb_reserved_word(s, (int)len)) {
+	if (!lvar_defined(p, var)) return ST_CONTINUE;
+    }
     node = node_assign(p, assignable(p, var, 0, arg->loc), NEW_LIT(ID2SYM(var), arg->loc), arg->loc);
     succ = arg->succ_block;
     if (!succ) succ = NEW_BEGIN(0, arg->loc);
diff --git a/test/ruby/test_regexp.rb b/test/ruby/test_regexp.rb
index 38147c7446..038c1c830f 100644
--- a/test/ruby/test_regexp.rb
+++ b/test/ruby/test_regexp.rb
@@ -218,6 +218,17 @@ class TestRegexp < Test::Unit::TestCase
   def test_assign_named_capture_to_reserved_word
     /(?<nil>.)/ =~ "a"
     assert_not_include(local_variables, :nil, "[ruby-dev:32675]")
+
+    def (obj = Object.new).test(s, nil: :ng)
+      /(?<nil>.)/ =~ s
+      binding.local_variable_get(:nil)
+    end
+    assert_equal("b", obj.test("b"))
+
+    tap do |nil: :ng|
+      /(?<nil>.)/ =~ "c"
+      assert_equal("c", binding.local_variable_get(:nil))
+    end
   end
 
   def test_assign_named_capture_to_const
diff --git a/version.h b/version.h
index ca6cbc67d2..5fc9f34f8f 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.6.7"
 #define RUBY_RELEASE_DATE "2021-04-05"
-#define RUBY_PATCHLEVEL 186
+#define RUBY_PATCHLEVEL 187
 
 #define RUBY_RELEASE_YEAR 2021
 #define RUBY_RELEASE_MONTH 4