diff --git a/tool/mk_builtin_binary.rb b/tool/mk_builtin_binary.rb
index eaa560fa26..416c6ef17e 100644
--- a/tool/mk_builtin_binary.rb
+++ b/tool/mk_builtin_binary.rb
@@ -5,9 +5,10 @@
 def dump_bin iseq
   bin = iseq.to_binary
   bin.each_byte.with_index{|b, index|
-    print "\n  " if (index%20) == 0
-    print "0x#{'%02x' % b.ord}, "
+    print "\n " if (index%20) == 0
+    print " 0x#{'%02x' % b.ord},"
   }
+  print "\n"
 end
 
 ary = []
@@ -25,12 +26,12 @@ puts <<H
 H
 
 ary.each{|feature, iseq|
-  puts "static const unsigned char #{feature}_bin[] = {"
+  print "\n""static const unsigned char #{feature}_bin[] = {"
     dump_bin(iseq)
   puts "};"
 }
 
-puts "static const struct builtin_binary builtin_binary[] = {"
+print "\n""static const struct builtin_binary builtin_binary[] = {\n"
 ary.each{|feature, iseq|
   puts "  {#{feature.dump}, #{feature}_bin, sizeof(#{feature}_bin)},"
 }