diff --git a/cmds/dumpsys/tests/dumpsys_test.cpp b/cmds/dumpsys/tests/dumpsys_test.cpp
index 66beb6d..5ca2b57 100644
--- a/cmds/dumpsys/tests/dumpsys_test.cpp
+++ b/cmds/dumpsys/tests/dumpsys_test.cpp
@@ -95,7 +95,7 @@
     }
     int i = 0;
     std::ostringstream actual_stream, expected_stream;
-    for (String16 actual : arg) {
+    for (const String16& actual : arg) {
         std::string actual_str = String8(actual).c_str();
         std::string expected_str = expected[i];
         actual_stream << "'" << actual_str << "' ";