diff --git a/adb/adb_io.cpp b/adb/adb_io.cpp
index 91b0d1f..f5cdcb5 100644
--- a/adb/adb_io.cpp
+++ b/adb/adb_io.cpp
@@ -34,7 +34,7 @@
 #include "adb_utils.h"
 #include "sysdeps.h"
 
-bool SendProtocolString(int fd, const std::string& s) {
+bool SendProtocolString(int fd, std::string_view s) {
     unsigned int length = s.size();
     if (length > MAX_PAYLOAD - 4) {
         errno = EMSGSIZE;
@@ -69,7 +69,7 @@
     return WriteFdExactly(fd, "OKAY", 4);
 }
 
-bool SendFail(int fd, const std::string& reason) {
+bool SendFail(int fd, std::string_view reason) {
     return WriteFdExactly(fd, "FAIL", 4) && SendProtocolString(fd, reason);
 }
 
diff --git a/adb/adb_io.h b/adb/adb_io.h
index e2df1b1..d6e65d8 100644
--- a/adb/adb_io.h
+++ b/adb/adb_io.h
@@ -20,6 +20,7 @@
 #include <sys/types.h>
 
 #include <string>
+#include <string_view>
 
 #include "adb_unique_fd.h"
 
@@ -27,10 +28,10 @@
 bool SendOkay(int fd);
 
 // Sends the protocol "FAIL" message, with the given failure reason.
-bool SendFail(int fd, const std::string& reason);
+bool SendFail(int fd, std::string_view reason);
 
 // Writes a protocol-format string; a four hex digit length followed by the string data.
-bool SendProtocolString(int fd, const std::string& s);
+bool SendProtocolString(int fd, std::string_view s);
 
 // Reads a protocol-format string; a four hex digit length followed by the string data.
 bool ReadProtocolString(int fd, std::string* s, std::string* error);