diff --git a/Polynomial/include/CGAL/Polynomial/bezout_matrix.h b/Polynomial/include/CGAL/Polynomial/bezout_matrix.h
index 4a2f57ff6cf..de2ea41e75d 100644
--- a/Polynomial/include/CGAL/Polynomial/bezout_matrix.h
+++ b/Polynomial/include/CGAL/Polynomial/bezout_matrix.h
@@ -596,8 +596,8 @@ polynomial_subresultant_matrix(typename Polynomial_traits_d::Polynomial_d f,
     // Divide through the divisor and set the correct sign
     for(int i=0;i<m;i++) {
       for(int j = i;j<m;j++) {
-	bool negate = ((n-m+i+1) & 2)>>1; // (n-m+i+1)==2 or 3 mod 4
-	negate=negate ^ (swapped & ((n-m+i+1)*(i+1)));  
+        bool negate = (((n-m+i+1) & 2)>>1) != 0; // (n-m+i+1)==2 or 3 mod 4
+        negate = negate != (swapped && (((n-m+i+1)*(i+1)) != 0));
 	//...XOR (swapped AND (n-m+i+1)* (i+1) is odd) 
 	Ret[i][j] = idiv(Ret[i][j],  negate ? -divisor : divisor);
       }