diff --git a/compile.c b/compile.c
index 5d37c730ef..f1cd30fe5f 100644
--- a/compile.c
+++ b/compile.c
@@ -9259,6 +9259,7 @@ ibf_dump_object_struct(struct ibf_dump *dump, VALUE obj)
 	range.beg = (long)ibf_dump_object(dump, beg);
 	range.end = (long)ibf_dump_object(dump, end);
 
+	IBF_W_ALIGN(struct ibf_object_struct_range);
 	IBF_WV(range);
     }
     else {
@@ -9425,7 +9426,7 @@ ibf_dump_object_object(struct ibf_dump *dump, VALUE obj)
     IBF_ZERO(obj_header);
     obj_header.type = TYPE(obj);
 
-    ibf_dump_align(dump, sizeof(ibf_offset_t));
+    IBF_W_ALIGN(ibf_offset_t);
     current_offset = ibf_dump_pos(dump);
 
     if (SPECIAL_CONST_P(obj)) {
diff --git a/test/ruby/test_iseq.rb b/test/ruby/test_iseq.rb
index 2ef344741b..86aad2da69 100644
--- a/test/ruby/test_iseq.rb
+++ b/test/ruby/test_iseq.rb
@@ -423,6 +423,7 @@ class TestISeq < Test::Unit::TestCase
 
   def test_to_binary_with_objects
     assert_iseq_to_binary("[]"+100.times.map{|i|"<</#{i}/"}.join)
+    assert_iseq_to_binary("@x ||= (1..2)")
   end
 
   def test_to_binary_line_info