diff --git a/test/unittest_nfc.cc b/test/unittest_nfc.cc
index b27eb5d..6147c49 100644
--- a/test/unittest_nfc.cc
+++ b/test/unittest_nfc.cc
@@ -4,6 +4,7 @@
 #include <vector>
 
 using namespace pEp;
+using std::string_view;
 
 namespace {
 
diff --git a/test/unittest_nfc16.cc b/test/unittest_nfc16.cc
index cd5e995..ef23de7 100644
--- a/test/unittest_nfc16.cc
+++ b/test/unittest_nfc16.cc
@@ -4,6 +4,7 @@
 #include <vector>
 
 using namespace pEp;
+using std::u16string_view;
 
 namespace pEp
 {