diff --git a/preprocessor/DynareMain.cc b/preprocessor/DynareMain.cc
index 44227c9c6..4e8709b22 100644
--- a/preprocessor/DynareMain.cc
+++ b/preprocessor/DynareMain.cc
@@ -17,8 +17,6 @@
  * along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-using namespace std;
-
 #include <iostream>
 #include <sstream>
 #include <fstream>
diff --git a/preprocessor/DynareMain2.cc b/preprocessor/DynareMain2.cc
index eb0446200..66ade0c84 100644
--- a/preprocessor/DynareMain2.cc
+++ b/preprocessor/DynareMain2.cc
@@ -17,8 +17,6 @@
  * along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-using namespace std;
-
 #include <iostream>
 
 #include "ParsingDriver.hh"
diff --git a/preprocessor/Shocks.cc b/preprocessor/Shocks.cc
index 1a943d2c6..d1c2ea702 100644
--- a/preprocessor/Shocks.cc
+++ b/preprocessor/Shocks.cc
@@ -17,8 +17,6 @@
  * along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-using namespace std;
-
 #include <cassert>
 #include <cstdlib>
 #include <iostream>
diff --git a/preprocessor/SigmaeInitialization.hh b/preprocessor/SigmaeInitialization.hh
index c2decb3f8..ddfcc7f10 100644
--- a/preprocessor/SigmaeInitialization.hh
+++ b/preprocessor/SigmaeInitialization.hh
@@ -20,8 +20,6 @@
 #ifndef _SIGMAEINITIALIZATION_HH
 #define _SIGMAEINITIALIZATION_HH
 
-using namespace std;
-
 #include <string>
 #include <vector>
 
diff --git a/preprocessor/Statement.hh b/preprocessor/Statement.hh
index ff0a53e0a..0563ced96 100644
--- a/preprocessor/Statement.hh
+++ b/preprocessor/Statement.hh
@@ -20,8 +20,6 @@
 #ifndef _STATEMENT_HH
 #define _STATEMENT_HH
 
-using namespace std;
-
 #include <ostream>
 #include <string>
 #include <map>
diff --git a/preprocessor/WarningConsolidation.cc b/preprocessor/WarningConsolidation.cc
index beaf061de..653d47305 100644
--- a/preprocessor/WarningConsolidation.cc
+++ b/preprocessor/WarningConsolidation.cc
@@ -17,8 +17,6 @@
  * along with Dynare.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-using namespace std;
-
 #include "WarningConsolidation.hh"
 #include <ostream>