diff --git a/src/math/polynomial/upolynomial_factorization.cpp b/src/math/polynomial/upolynomial_factorization.cpp
index fad8a85e4..310a11fd1 100644
--- a/src/math/polynomial/upolynomial_factorization.cpp
+++ b/src/math/polynomial/upolynomial_factorization.cpp
@@ -27,7 +27,7 @@ Notes:
 #include "math/polynomial/upolynomial_factorization_int.h"
 #include "util/prime_generator.h"
 
-using namespace std;
+using std::endl;
 
 namespace upolynomial {