diff --git a/ruby/ext/google/protobuf_c/map.c b/ruby/ext/google/protobuf_c/map.c
index 00d23a76fa30..2caffd086150 100644
--- a/ruby/ext/google/protobuf_c/map.c
+++ b/ruby/ext/google/protobuf_c/map.c
@@ -827,6 +827,8 @@ void Map_register(VALUE module) {
   rb_define_method(klass, "clear", Map_clear, 0);
   rb_define_method(klass, "length", Map_length, 0);
   rb_define_method(klass, "dup", Map_dup, 0);
+  // Also define #clone so that we don't inherit Object#clone.
+  rb_define_method(klass, "clone", Map_dup, 0);
   rb_define_method(klass, "==", Map_eq, 1);
   rb_define_method(klass, "hash", Map_hash, 0);
   rb_define_method(klass, "to_h", Map_to_h, 0);