diff --git a/adb/adb.cpp b/adb/adb.cpp
index 3dcf282..1eb3a3c 100644
--- a/adb/adb.cpp
+++ b/adb/adb.cpp
@@ -245,7 +245,7 @@
 
     if (pieces.size() > 2) {
         const std::string& props = pieces[2];
-        for (auto& prop : android::base::Split(props, ";")) {
+        for (const auto& prop : android::base::Split(props, ";")) {
             // The list of properties was traditionally ;-terminated rather than ;-separated.
             if (prop.empty()) continue;
 
diff --git a/adb/adb_auth_host.cpp b/adb/adb_auth_host.cpp
index 7b314c3..5309519 100644
--- a/adb/adb_auth_host.cpp
+++ b/adb/adb_auth_host.cpp
@@ -368,7 +368,7 @@
         return;
     }
 
-    for (auto& path : android::base::Split(adb_keys_path, ENV_PATH_SEPARATOR_STR)) {
+    for (const auto& path : android::base::Split(adb_keys_path, ENV_PATH_SEPARATOR_STR)) {
         if (!read_key(path.c_str(), key_list)) {
             D("Failed to read '%s'", path.c_str());
         }
diff --git a/adb/fdevent.cpp b/adb/fdevent.cpp
index 18b64f6..ddd15a2 100644
--- a/adb/fdevent.cpp
+++ b/adb/fdevent.cpp
@@ -199,7 +199,7 @@
 
 static std::string dump_pollfds(const std::vector<pollfd>& pollfds) {
     std::string result;
-    for (auto& pollfd : pollfds) {
+    for (const auto& pollfd : pollfds) {
         std::string op;
         if (pollfd.events & POLLIN) {
             op += "R";
@@ -214,8 +214,8 @@
 
 static void fdevent_process() {
     std::vector<pollfd> pollfds;
-    for (auto it = g_poll_node_map.begin(); it != g_poll_node_map.end(); ++it) {
-        pollfds.push_back(it->second.pollfd);
+    for (const auto& pair : g_poll_node_map) {
+        pollfds.push_back(pair.second.pollfd);
     }
     CHECK_GT(pollfds.size(), 0u);
     D("poll(), pollfds = %s", dump_pollfds(pollfds).c_str());
@@ -224,7 +224,7 @@
         PLOG(ERROR) << "poll(), ret = " << ret;
         return;
     }
-    for (auto& pollfd : pollfds) {
+    for (const auto& pollfd : pollfds) {
         if (pollfd.revents != 0) {
             D("for fd %d, revents = %x", pollfd.fd, pollfd.revents);
         }
diff --git a/adb/file_sync_service.cpp b/adb/file_sync_service.cpp
index 9b56392..298ed82 100644
--- a/adb/file_sync_service.cpp
+++ b/adb/file_sync_service.cpp
@@ -56,7 +56,7 @@
     path_components.pop_back(); // For "/system/bin/sh", only create "/system/bin".
 
     std::string partial_path;
-    for (auto& path_component : path_components) {
+    for (const auto& path_component : path_components) {
         if (partial_path.back() != OS_PATH_SEPARATOR) partial_path += OS_PATH_SEPARATOR;
         partial_path += path_component;
 
diff --git a/adb/transport.cpp b/adb/transport.cpp
index f8cf63a..e9e774f 100644
--- a/adb/transport.cpp
+++ b/adb/transport.cpp
@@ -825,7 +825,7 @@
 }
 
 void atransport::RunDisconnects() {
-    for (auto& disconnect : disconnects_) {
+    for (const auto& disconnect : disconnects_) {
         disconnect->func(disconnect->opaque, this);
     }
     disconnects_.clear();
@@ -872,7 +872,7 @@
 std::string list_transports(bool long_listing) {
     std::string result;
     adb_mutex_lock(&transport_lock);
-    for (const auto t : transport_list) {
+    for (const auto& t : transport_list) {
         append_transport(t, &result, long_listing);
     }
     adb_mutex_unlock(&transport_lock);
@@ -882,7 +882,7 @@
 /* hack for osx */
 void close_usb_devices() {
     adb_mutex_lock(&transport_lock);
-    for (auto t : transport_list) {
+    for (const auto& t : transport_list) {
         if (!t->kicked) {
             t->kicked = 1;
             t->kick(t);
@@ -908,7 +908,7 @@
     }
 
     adb_mutex_lock(&transport_lock);
-    for (auto transport : pending_list) {
+    for (const auto& transport : pending_list) {
         if (transport->serial && strcmp(serial, transport->serial) == 0) {
             adb_mutex_unlock(&transport_lock);
             delete t;
@@ -916,7 +916,7 @@
         }
     }
 
-    for (auto transport : transport_list) {
+    for (const auto& transport : transport_list) {
         if (transport->serial && strcmp(serial, transport->serial) == 0) {
             adb_mutex_unlock(&transport_lock);
             delete t;