diff --git a/STL_Extension/include/CGAL/Handle_with_policy.h b/STL_Extension/include/CGAL/Handle_with_policy.h
index 5476089351e..883f0f4e0cd 100644
--- a/STL_Extension/include/CGAL/Handle_with_policy.h
+++ b/STL_Extension/include/CGAL/Handle_with_policy.h
@@ -101,7 +101,7 @@ struct Int_t : public Handle_with_policy< Int_rep, Unify > {
     bool operator==( const Int_t<Unify>& i) const {
         bool equal = (value() == i.value());
         if ( equal)
-            unify(i);
+            Base::unify(i);
         return equal;
     }
 };
@@ -160,7 +160,7 @@ struct Int_vt : public Handle_with_policy< Int_vrep<Unify,Alloc>, Unify > {
     bool operator==( const Int_vt<Unify>& i) const {
         bool equal = (value() == i.value());
         if ( equal)
-            unify(i);
+            Base::unify(i);
         return equal;
     }
 };
diff --git a/STL_Extension/test/STL_Extension/test_Cache.cpp b/STL_Extension/test/STL_Extension/test_Cache.cpp
index 7a8959d010a..61f1e209eb9 100644
--- a/STL_Extension/test/STL_Extension/test_Cache.cpp
+++ b/STL_Extension/test/STL_Extension/test_Cache.cpp
@@ -50,7 +50,7 @@ struct Int_t : public CGAL::Handle_with_policy< Int_rep, Unify > {
     bool operator==( const Int_t<Unify>& i) const {
         bool equal = (value() == i.value());
         if ( equal)
-            unify(i);
+            Base::unify(i);
         return equal;
     }
 };
diff --git a/STL_Extension/test/STL_Extension/test_Handle_with_policy.cpp b/STL_Extension/test/STL_Extension/test_Handle_with_policy.cpp
index c6227b3aea8..f343c7d9c56 100644
--- a/STL_Extension/test/STL_Extension/test_Handle_with_policy.cpp
+++ b/STL_Extension/test/STL_Extension/test_Handle_with_policy.cpp
@@ -51,7 +51,7 @@ struct Int_t : public ::CGAL::Handle_with_policy< Int_rep, Unify > {
     bool operator==( const Int_t<Unify>& i) const {
         bool equal = (value() == i.value());
         if ( equal)
-            unify(i);
+            Base::unify(i);
         return equal;
     }
 };
@@ -303,7 +303,7 @@ struct Int_vt : public ::CGAL::Handle_with_policy< Int_vrep<Unify,Alloc>, Unify
     bool operator==( const Int_vt<Unify>& i) const {
         bool equal = (value() == i.value());
         if ( equal)
-            unify(i);
+            Base::unify(i);
         return equal;
     }
 };