diff --git a/test/test_string_stream.cpp b/test/test_string_stream.cpp
index 4fbcaf92..c2a7bb61 100644
--- a/test/test_string_stream.cpp
+++ b/test/test_string_stream.cpp
@@ -63,18 +63,6 @@ namespace
 
 namespace etl
 {
-  //***********************************
-  template <size_t SIZE>
-  std::ostream& operator << (std::ostream& os, const etl::string<SIZE>& str)
-  {
-    for (auto c : str)
-    {
-      os << c;
-    }
-
-    return os;
-  }
-
   //***********************************
   std::ostream& operator << (std::ostream& os, const IString& str)
   {