diff --git a/src/quick-lint-js/container/byte-buffer.cpp b/src/quick-lint-js/container/byte-buffer.cpp
index 96e5fbfc37..ea02b207f6 100644
--- a/src/quick-lint-js/container/byte-buffer.cpp
+++ b/src/quick-lint-js/container/byte-buffer.cpp
@@ -68,7 +68,10 @@ Byte_Buffer_Chunk make_chunk(const void* data, Byte_Buffer::Size_Type size) {
 
 }
 
-Byte_Buffer::Byte_Buffer() { this->add_new_chunk(this->default_chunk_size); }
+Byte_Buffer::Byte_Buffer()
+    : chunks_("Byte_Buffer::chunks_", new_delete_resource()) {
+  this->add_new_chunk(this->default_chunk_size);
+}
 
 Byte_Buffer::Byte_Buffer(Byte_Buffer&&) = default;
 
@@ -107,7 +110,7 @@ void Byte_Buffer::prepend_copy(String8_View data) {
       std::copy_n(data_bytes, data.size(), chunk_begin(prefix_chunk));
   QLJS_ASSERT(end == chunk_end(prefix_chunk));
 
-  this->chunks_.insert(this->chunks_.begin(), std::move(prefix_chunk));
+  this->chunks_.push_front(std::move(prefix_chunk));
 }
 
 void Byte_Buffer::clear() {
@@ -123,7 +126,7 @@ void Byte_Buffer::clear() {
 
 Byte_Buffer::Size_Type Byte_Buffer::size() const {
   Size_Type total_size = 0;
-  for (std::size_t chunk_index = 0; chunk_index < this->chunks_.size() - 1;
+  for (Vector_Size chunk_index = 0; chunk_index < this->chunks_.size() - 1;
        ++chunk_index) {
     const Byte_Buffer_Chunk& c = this->chunks_[chunk_index];
     total_size += chunk_size(c);
@@ -136,7 +139,7 @@ bool Byte_Buffer::empty() const {
   if (this->bytes_used_in_current_chunk() > 0) {
     return false;
   }
-  for (std::size_t chunk_index = 0; chunk_index < this->chunks_.size() - 1;
+  for (Vector_Size chunk_index = 0; chunk_index < this->chunks_.size() - 1;
        ++chunk_index) {
     const Byte_Buffer_Chunk& c = this->chunks_[chunk_index];
     if (chunk_size(c) > 0) {
diff --git a/src/quick-lint-js/container/byte-buffer.h b/src/quick-lint-js/container/byte-buffer.h
index 0b3b98c440..4eb87905b8 100644
--- a/src/quick-lint-js/container/byte-buffer.h
+++ b/src/quick-lint-js/container/byte-buffer.h
@@ -6,12 +6,12 @@
 #include <cstddef>
 #include <memory>
 #include <quick-lint-js/assert.h>
+#include <quick-lint-js/container/vector.h>
 #include <quick-lint-js/port/char8.h>
 #include <quick-lint-js/port/have.h>
 #include <quick-lint-js/util/cast.h>
 #include <quick-lint-js/util/integer.h>
 #include <utility>
-#include <vector>
 
 #if QLJS_HAVE_WRITEV
 #include <sys/uio.h>
@@ -89,7 +89,7 @@ class Byte_Buffer {
 
   template <class Func>
   void enumerate_chunks(Func&& on_chunk) const {
-    for (std::size_t chunk_index = 0; chunk_index < this->chunks_.size();
+    for (Vector_Size chunk_index = 0; chunk_index < this->chunks_.size();
          ++chunk_index) {
       const Byte_Buffer_Chunk* c = &this->chunks_[chunk_index];
       const std::byte* c_begin =
@@ -128,7 +128,7 @@ class Byte_Buffer {
   static Byte_Buffer_Chunk allocate_chunk(Size_Type size);
   static void delete_chunk(Byte_Buffer_Chunk&&);
 
-  std::vector<Byte_Buffer_Chunk> chunks_;
+  Vector<Byte_Buffer_Chunk> chunks_;
   std::byte* cursor_;
   std::byte* current_chunk_end_;
 
diff --git a/src/quick-lint-js/container/vector-profiler.h b/src/quick-lint-js/container/vector-profiler.h
index b7f4cf2e42..8ba414f4b3 100644
--- a/src/quick-lint-js/container/vector-profiler.h
+++ b/src/quick-lint-js/container/vector-profiler.h
@@ -236,6 +236,10 @@ class Instrumented_Vector {
     return this->data_[index];
   }
 
+  QLJS_FORCE_INLINE const value_type &operator[](size_type index) const {
+    return this->data_[index];
+  }
+
   QLJS_FORCE_INLINE value_type *begin() { return this->data(); }
   QLJS_FORCE_INLINE value_type *end() { return this->begin() + this->size(); }
 
diff --git a/src/quick-lint-js/container/vector.h b/src/quick-lint-js/container/vector.h
index d1d8651d81..858351a99f 100644
--- a/src/quick-lint-js/container/vector.h
+++ b/src/quick-lint-js/container/vector.h
@@ -186,6 +186,10 @@ class Raw_Vector {
     QLJS_ASSERT(index < this->size());
     return this->data_[index];
   }
+  const T &operator[](size_type index) const {
+    QLJS_ASSERT(index < this->size());
+    return this->data_[index];
+  }
 
   // Precondition: (none)
   void reserve(size_type new_capacity) {