diff --git a/common/fake_prefs.cc b/common/fake_prefs.cc
index 275667e..ea6ea60 100644
--- a/common/fake_prefs.cc
+++ b/common/fake_prefs.cc
@@ -17,6 +17,7 @@
 #include "update_engine/common/fake_prefs.h"
 
 #include <algorithm>
+#include <utility>
 
 #include <gtest/gtest.h>
 
@@ -66,8 +67,8 @@
   return GetValue(key, value);
 }
 
-bool FakePrefs::SetString(const string& key, const string& value) {
-  SetValue(key, value);
+bool FakePrefs::SetString(const string& key, std::string_view value) {
+  SetValue(key, std::string(value));
   return true;
 }
 
@@ -149,10 +150,10 @@
 }
 
 template <typename T>
-void FakePrefs::SetValue(const string& key, const T& value) {
+void FakePrefs::SetValue(const string& key, T value) {
   CheckKeyType(key, PrefConsts<T>::type);
   values_[key].type = PrefConsts<T>::type;
-  values_[key].value.*(PrefConsts<T>::member) = value;
+  values_[key].value.*(PrefConsts<T>::member) = std::move(value);
   const auto observers_for_key = observers_.find(key);
   if (observers_for_key != observers_.end()) {
     std::vector<ObserverInterface*> copy_observers(observers_for_key->second);
diff --git a/common/fake_prefs.h b/common/fake_prefs.h
index 9af2550..430c291 100644
--- a/common/fake_prefs.h
+++ b/common/fake_prefs.h
@@ -19,6 +19,7 @@
 
 #include <map>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include <base/macros.h>
@@ -40,7 +41,7 @@
 
   // PrefsInterface methods.
   bool GetString(const std::string& key, std::string* value) const override;
-  bool SetString(const std::string& key, const std::string& value) override;
+  bool SetString(const std::string& key, std::string_view value) override;
   bool GetInt64(const std::string& key, int64_t* value) const override;
   bool SetInt64(const std::string& key, const int64_t value) override;
   bool GetBoolean(const std::string& key, bool* value) const override;
@@ -96,7 +97,7 @@
   // Helper function to set a value of the passed |key|. It sets the type based
   // on the template parameter T.
   template <typename T>
-  void SetValue(const std::string& key, const T& value);
+  void SetValue(const std::string& key, T value);
 
   // Helper function to get a value from the map checking for invalid calls.
   // The function fails the test if you attempt to read a value  defined as a
diff --git a/common/mock_prefs.h b/common/mock_prefs.h
index c91664e..49431fb 100644
--- a/common/mock_prefs.h
+++ b/common/mock_prefs.h
@@ -31,8 +31,7 @@
  public:
   MOCK_CONST_METHOD2(GetString,
                      bool(const std::string& key, std::string* value));
-  MOCK_METHOD2(SetString,
-               bool(const std::string& key, const std::string& value));
+  MOCK_METHOD2(SetString, bool(const std::string& key, std::string_view value));
   MOCK_CONST_METHOD2(GetInt64, bool(const std::string& key, int64_t* value));
   MOCK_METHOD2(SetInt64, bool(const std::string& key, const int64_t value));
 
diff --git a/common/prefs.cc b/common/prefs.cc
index 84fe536..1e06be4 100644
--- a/common/prefs.cc
+++ b/common/prefs.cc
@@ -55,7 +55,7 @@
   return storage_->GetKey(key, value);
 }
 
-bool PrefsBase::SetString(const string& key, const string& value) {
+bool PrefsBase::SetString(const string& key, std::string_view value) {
   TEST_AND_RETURN_FALSE(storage_->SetKey(key, value));
   const auto observers_for_key = observers_.find(key);
   if (observers_for_key != observers_.end()) {
@@ -192,7 +192,7 @@
   return true;
 }
 
-bool Prefs::FileStorage::SetKey(const string& key, const string& value) {
+bool Prefs::FileStorage::SetKey(const string& key, std::string_view value) {
   base::FilePath filename;
   TEST_AND_RETURN_FALSE(GetFileNameForKey(key, &filename));
   if (!base::DirectoryExists(filename.DirName())) {
@@ -263,7 +263,7 @@
 }
 
 bool MemoryPrefs::MemoryStorage::SetKey(const string& key,
-                                        const string& value) {
+                                        std::string_view value) {
   values_[key] = value;
   return true;
 }
diff --git a/common/prefs.h b/common/prefs.h
index d6ef668..93477dd 100644
--- a/common/prefs.h
+++ b/common/prefs.h
@@ -19,6 +19,7 @@
 
 #include <map>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include <base/files/file_path.h>
@@ -49,7 +50,7 @@
 
     // Set the value of the key named |key| to |value| regardless of the
     // previous value. Returns whether the operation succeeded.
-    virtual bool SetKey(const std::string& key, const std::string& value) = 0;
+    virtual bool SetKey(const std::string& key, std::string_view value) = 0;
 
     // Returns whether the key named |key| exists.
     virtual bool KeyExists(const std::string& key) const = 0;
@@ -66,7 +67,7 @@
 
   // PrefsInterface methods.
   bool GetString(const std::string& key, std::string* value) const override;
-  bool SetString(const std::string& key, const std::string& value) override;
+  bool SetString(const std::string& key, std::string_view value) override;
   bool GetInt64(const std::string& key, int64_t* value) const override;
   bool SetInt64(const std::string& key, const int64_t value) override;
   bool GetBoolean(const std::string& key, bool* value) const override;
@@ -123,7 +124,7 @@
     bool GetKey(const std::string& key, std::string* value) const override;
     bool GetSubKeys(const std::string& ns,
                     std::vector<std::string>* keys) const override;
-    bool SetKey(const std::string& key, const std::string& value) override;
+    bool SetKey(const std::string& key, std::string_view value) override;
     bool KeyExists(const std::string& key) const override;
     bool DeleteKey(const std::string& key) override;
 
@@ -163,7 +164,7 @@
     bool GetKey(const std::string& key, std::string* value) const override;
     bool GetSubKeys(const std::string& ns,
                     std::vector<std::string>* keys) const override;
-    bool SetKey(const std::string& key, const std::string& value) override;
+    bool SetKey(const std::string& key, std::string_view value) override;
     bool KeyExists(const std::string& key) const override;
     bool DeleteKey(const std::string& key) override;
 
diff --git a/common/prefs_interface.h b/common/prefs_interface.h
index 866d0ca..e773a35 100644
--- a/common/prefs_interface.h
+++ b/common/prefs_interface.h
@@ -52,7 +52,7 @@
 
   // Associates |key| with a string |value|. Returns true on success,
   // false otherwise.
-  virtual bool SetString(const std::string& key, const std::string& value) = 0;
+  virtual bool SetString(const std::string& key, std::string_view value) = 0;
 
   // Gets an int64_t |value| associated with |key|. Returns true on
   // success, false on failure (including when the |key| is not
diff --git a/payload_consumer/delta_performer.cc b/payload_consumer/delta_performer.cc
index 5b41485..08118d8 100644
--- a/payload_consumer/delta_performer.cc
+++ b/payload_consumer/delta_performer.cc
@@ -436,7 +436,8 @@
       return false;
     manifest_valid_ = true;
     if (!install_plan_->is_resume) {
-      prefs_->SetString(kPrefsManifestBytes, {buffer_.begin(), buffer_.end()});
+      auto begin = reinterpret_cast<const char*>(buffer_.data());
+      prefs_->SetString(kPrefsManifestBytes, {begin, buffer_.size()});
     }
 
     // Clear the download buffer.