diff --git a/libs/androidfw/Locale.cpp b/libs/androidfw/Locale.cpp
index d87a3ce..272a988 100644
--- a/libs/androidfw/Locale.cpp
+++ b/libs/androidfw/Locale.cpp
@@ -66,7 +66,7 @@
   return std::all_of(std::begin(str), std::end(str), ::isdigit);
 }
 
-bool LocaleValue::InitFromFilterString(const StringPiece& str) {
+bool LocaleValue::InitFromFilterString(StringPiece str) {
   // A locale (as specified in the filter) is an underscore separated name such
   // as "en_US", "en_Latn_US", or "en_US_POSIX".
   std::vector<std::string> parts = util::SplitAndLowercase(str, '_');
@@ -132,11 +132,11 @@
   return true;
 }
 
-bool LocaleValue::InitFromBcp47Tag(const StringPiece& bcp47tag) {
+bool LocaleValue::InitFromBcp47Tag(StringPiece bcp47tag) {
   return InitFromBcp47TagImpl(bcp47tag, '-');
 }
 
-bool LocaleValue::InitFromBcp47TagImpl(const StringPiece& bcp47tag, const char separator) {
+bool LocaleValue::InitFromBcp47TagImpl(StringPiece bcp47tag, const char separator) {
   std::vector<std::string> subtags = util::SplitAndLowercase(bcp47tag, separator);
   if (subtags.size() == 1) {
     set_language(subtags[0].c_str());