diff --git a/test/string_ref_test2.cpp b/test/string_ref_test2.cpp
index 174405d..9559c67 100644
--- a/test/string_ref_test2.cpp
+++ b/test/string_ref_test2.cpp
@@ -18,7 +18,7 @@
 typedef boost::string_ref string_ref;
 
 void ends_with ( const char *arg ) {
-    const size_t sz = strlen ( arg );
+    const size_t sz = std::strlen ( arg );
     string_ref sr ( arg );
     string_ref sr2 ( arg );
     const char *p = arg;
@@ -48,7 +48,7 @@ void ends_with ( const char *arg ) {
     }
 
 void starts_with ( const char *arg ) {
-    const size_t sz = strlen ( arg );
+    const size_t sz = std::strlen ( arg );
     string_ref sr  ( arg );
     string_ref sr2 ( arg );
     const char *p = arg + std::strlen ( arg ) - 1;
@@ -159,7 +159,7 @@ void find ( const char *arg ) {
 
 //  Find everything at the end
     sr1  = arg;
-    p    = arg + strlen ( arg ) - 1;
+    p    = arg + std::strlen ( arg ) - 1;
     while ( !sr1.empty ()) {
         string_ref::size_type pos = sr1.rfind(*p);
         BOOST_CHECK ( pos == sr1.size () - 1 );
@@ -180,7 +180,7 @@ void find ( const char *arg ) {
 
 //  Find everything at the end
     sr1  = arg;
-    p    = arg + strlen ( arg ) - 1;
+    p    = arg + std::strlen ( arg ) - 1;
     while ( !sr1.empty ()) {
         string_ref::size_type pos = sr1.find_last_of(*p);
         BOOST_CHECK ( pos == sr1.size () - 1 );