diff --git a/deflate/flate2.cc b/deflate/flate2.cc
index 0b147a8..59265f3 100644
--- a/deflate/flate2.cc
+++ b/deflate/flate2.cc
@@ -19,7 +19,7 @@ using ::security::crubit_helpers::StringViewFromVecU8;
 VecU8Wrapper::VecU8Wrapper(rust::vec_u8::VecU8 vec_u8)
     : vec_u8_(std::move(vec_u8)) {}
 
-absl::string_view VecU8Wrapper::as_string_view() const {
+absl::string_view VecU8Wrapper::as_string_view() const& {
   return StringViewFromVecU8(vec_u8_);
 }
 
diff --git a/deflate/flate2.h b/deflate/flate2.h
index 1113591..1fa6ede 100644
--- a/deflate/flate2.h
+++ b/deflate/flate2.h
@@ -110,7 +110,8 @@ class GzHeader final {
 class VecU8Wrapper {
  public:
   explicit VecU8Wrapper(rust::vec_u8::VecU8 vec_u8);
-  absl::string_view as_string_view() const ABSL_ATTRIBUTE_LIFETIME_BOUND;
+  absl::string_view as_string_view() const& ABSL_ATTRIBUTE_LIFETIME_BOUND;
+  absl::string_view as_string_view() const&& = delete;
   absl::Cord as_cord() &&;
 
  private: