diff --git a/Algebraic_foundations/include/CGAL/Scalar_factor_traits.h b/Algebraic_foundations/include/CGAL/Scalar_factor_traits.h
index 39055e66dd0..e1182918432 100644
--- a/Algebraic_foundations/include/CGAL/Scalar_factor_traits.h
+++ b/Algebraic_foundations/include/CGAL/Scalar_factor_traits.h
@@ -60,8 +60,8 @@ public:
         static Scalar scalar_factor(const NT& a, Field_tag) {
             return (a == NT(0)) ? NT(0) : NT(1);
         }
-        static Scalar scalar_factor(const NT& a, 
-                                    const Scalar& d,
+        static Scalar scalar_factor(const NT& /* a */, 
+                                    const Scalar& /* d */,
                                     Integral_domain_tag) {
             return Scalar(1);
         }
diff --git a/Core/include/CGAL/CORE/poly/Sturm.h b/Core/include/CGAL/CORE/poly/Sturm.h
index 5459543139e..8332d67a514 100644
--- a/Core/include/CGAL/CORE/poly/Sturm.h
+++ b/Core/include/CGAL/CORE/poly/Sturm.h
@@ -125,7 +125,7 @@ public:
   // 	various support methods in BigFloat.h (exact_div, gcd, etc).
   // Constructor from a BigFloat polynomial 
   //	Need the fake argument to avoid compiler overloading errors
-  Sturm(Polynomial<BigFloat> pp, bool fake) : NEWTON_DIV_BY_ZERO(false) {
+  Sturm(Polynomial<BigFloat> pp, bool /* fake */) : NEWTON_DIV_BY_ZERO(false) {
     len = pp.getTrueDegree();
     if (len <= 0) return; // hence, seq is not defined in these cases
     seq = new Polynomial<NT> [len+1];