diff --git a/src/stringlist.cc b/src/stringlist.cc
index 360abaa..0f2ff01 100644
--- a/src/stringlist.cc
+++ b/src/stringlist.cc
@@ -14,7 +14,7 @@ namespace pEp
     }
     
     template<>
-    char* stringlist_t::* const ListWrapper<stringlist_t*, char*>::Value = &stringlist_t::value;
+    const char* stringlist_t::* const ListWrapper<stringlist_t*, const char*>::Value = &stringlist_t::value;
 
     template<>
     int StringList::size() const