diff --git a/Modular_arithmetic/include/CGAL/modular_gcd.h b/Modular_arithmetic/include/CGAL/modular_gcd.h
index 4a8f6b46391..b57d31a342f 100644
--- a/Modular_arithmetic/include/CGAL/modular_gcd.h
+++ b/Modular_arithmetic/include/CGAL/modular_gcd.h
@@ -126,7 +126,7 @@ Polynomial<Coeff> algorithm_x(
     int prime_index = -1;
     int n = 0; // number of lucky primes 
     std::vector<int> dv_F1 = degree_vector(F1);
-    std::vector<int> dv_F2 = degree_vector(F1);
+    std::vector<int> dv_F2 = degree_vector(F2);
     std::vector<int> dv_e = min(dv_F1,dv_F2);;
  
     MScalar mg_;