diff --git a/src/MESONT/angle_mesocnt.cpp b/src/MESONT/angle_mesocnt.cpp
index 0daa103548..a2fabf4cc6 100644
--- a/src/MESONT/angle_mesocnt.cpp
+++ b/src/MESONT/angle_mesocnt.cpp
@@ -32,6 +32,8 @@
 #include <cmath>
 
 using namespace LAMMPS_NS;
+using MathConst::DEG2RAD;
+using MathConst::RAD2DEG;
 using MathConst::MY_PI;
 using MathConst::MY_2PI;
 
diff --git a/src/MESONT/bond_mesocnt.cpp b/src/MESONT/bond_mesocnt.cpp
index 473d67c0bd..493ed3f599 100644
--- a/src/MESONT/bond_mesocnt.cpp
+++ b/src/MESONT/bond_mesocnt.cpp
@@ -31,7 +31,7 @@
 #include <cstring>
 
 using namespace LAMMPS_NS;
-using namespace MathConst;
+using MathConst::MY_2PI;
 
 static constexpr double A_CC = 1.421;
 
diff --git a/src/MESONT/pair_mesocnt.cpp b/src/MESONT/pair_mesocnt.cpp
index d63743f5a9..3c8fc1234e 100644
--- a/src/MESONT/pair_mesocnt.cpp
+++ b/src/MESONT/pair_mesocnt.cpp
@@ -39,8 +39,9 @@
 #include <vector>
 
 using namespace LAMMPS_NS;
-using namespace MathConst;
 using namespace MathExtra;
+using MathConst::MY_PI;
+using MathConst::MY_2PI;
 
 #define MAXLINE 1024
 #define SELF_CUTOFF 3
diff --git a/src/MESONT/pair_mesocnt_viscous.cpp b/src/MESONT/pair_mesocnt_viscous.cpp
index cd28946d79..e26b80acd8 100644
--- a/src/MESONT/pair_mesocnt_viscous.cpp
+++ b/src/MESONT/pair_mesocnt_viscous.cpp
@@ -35,8 +35,8 @@
 #include <fstream>
 
 using namespace LAMMPS_NS;
-using namespace MathConst;
 using namespace MathExtra;
+using MathConst::MY_PI;
 
 #define SELF_CUTOFF 3
 #define RHOMIN 10.0