diff --git a/src/google/protobuf/inlined_string_field_unittest.cc b/src/google/protobuf/inlined_string_field_unittest.cc
index ae731d643c..90c141220f 100644
--- a/src/google/protobuf/inlined_string_field_unittest.cc
+++ b/src/google/protobuf/inlined_string_field_unittest.cc
@@ -52,8 +52,6 @@ namespace protobuf {
 using internal::ArenaStringPtr;
 using internal::InlinedStringField;
 
-static std::string WrapString(const char* value) { return value; }
-
 namespace {
 }  // namespace
 }  // namespace protobuf