diff --git a/payload_generator/extent_utils.h b/payload_generator/extent_utils.h
index bd9fc8b..17995b1 100644
--- a/payload_generator/extent_utils.h
+++ b/payload_generator/extent_utils.h
@@ -105,25 +105,25 @@
 // }
 struct BlockIterator {
   explicit BlockIterator(
-      const google::protobuf::RepeatedPtrField<Extent>& src_extents)
-      : src_extents_(src_extents) {}
+      const google::protobuf::RepeatedPtrField<Extent>& extents)
+      : extents_(extents) {}
 
   BlockIterator& operator++() {
-    CHECK_LT(cur_extent_, src_extents_.size());
+    CHECK_LT(cur_extent_, extents_.size());
     block_offset_++;
-    if (block_offset_ >= src_extents_[cur_extent_].num_blocks()) {
+    if (block_offset_ >= extents_[cur_extent_].num_blocks()) {
       cur_extent_++;
       block_offset_ = 0;
     }
     return *this;
   }
 
-  [[nodiscard]] bool is_end() { return cur_extent_ >= src_extents_.size(); }
+  [[nodiscard]] bool is_end() { return cur_extent_ >= extents_.size(); }
   [[nodiscard]] uint64_t operator*() {
-    return src_extents_[cur_extent_].start_block() + block_offset_;
+    return extents_[cur_extent_].start_block() + block_offset_;
   }
 
-  const google::protobuf::RepeatedPtrField<Extent>& src_extents_;
+  const google::protobuf::RepeatedPtrField<Extent>& extents_;
   int cur_extent_ = 0;
   size_t block_offset_ = 0;
 };