diff --git a/src/dwarfs/filesystem_writer.cpp b/src/dwarfs/filesystem_writer.cpp
index 3ea034cc..70aacef5 100644
--- a/src/dwarfs/filesystem_writer.cpp
+++ b/src/dwarfs/filesystem_writer.cpp
@@ -383,7 +383,9 @@ void filesystem_writer_<LoggerPolicy>::write(folly::ByteRange range) {
 
 template <typename LoggerPolicy>
 void filesystem_writer_<LoggerPolicy>::write(fsblock const& fsb) {
-  push_section_index(fsb.type());
+  if (fsb.type() != section_type::SECTION_INDEX) {
+    push_section_index(fsb.type());
+  }
 
   write(fsb.header());
   write(fsb.data());