diff --git a/complex.c b/complex.c
index 7a9c56d..ad1ea85 100644
--- a/complex.c
+++ b/complex.c
@@ -2234,6 +2234,7 @@ Init_Complex(void)
     rb_undef_method(rb_cComplex, ">");
     rb_undef_method(rb_cComplex, ">=");
     rb_undef_method(rb_cComplex, "between?");
+    rb_undef_method(rb_cComplex, "clamp");
     rb_undef_method(rb_cComplex, "div");
     rb_undef_method(rb_cComplex, "divmod");
     rb_undef_method(rb_cComplex, "floor");
diff --git a/test/ruby/test_complex.rb b/test/ruby/test_complex.rb
index 93d24a1..2f21c10 100644
--- a/test/ruby/test_complex.rb
+++ b/test/ruby/test_complex.rb
@@ -755,6 +755,7 @@ def test_respond
     assert_equal(false, c.respond_to?(:>))
     assert_equal(false, c.respond_to?(:>=))
     assert_equal(false, c.respond_to?(:between?))
+    assert_equal(false, c.respond_to?(:clamp))
     assert_equal(false, c.respond_to?(:div))
     assert_equal(false, c.respond_to?(:divmod))
     assert_equal(false, c.respond_to?(:floor))