diff --git a/src/math_const.h b/src/math_const.h
index fefb442f68..53a485bf99 100644
--- a/src/math_const.h
+++ b/src/math_const.h
@@ -17,18 +17,18 @@
 namespace LAMMPS_NS {
 
 namespace MathConst {
-  static const double THIRD  = 1.0/3.0;
-  static const double TWOTHIRDS  = 2.0/3.0;
-  static const double MY_PI  = 3.14159265358979323846; // pi
-  static const double MY_2PI = 6.28318530717958647692; // 2pi
-  static const double MY_3PI = 9.42477796076937971538; // 3pi
-  static const double MY_4PI = 12.56637061435917295384; // 4pi
-  static const double MY_PI2 = 1.57079632679489661923; // pi/2
-  static const double MY_PI4 = 0.78539816339744830962; // pi/4
-  static const double MY_PIS = 1.77245385090551602729; // sqrt(pi)
-  static const double MY_ISPI4 = 1.12837916709551257389; // 1/sqrt(pi/4)
-  static const double MY_SQRT2 = 1.41421356237309504880; // sqrt(2)
-  static const double MY_CBRT2 = 1.25992104989487316476; // 2*(1/3)
+  static constexpr double THIRD  = 1.0/3.0;
+  static constexpr double TWOTHIRDS  = 2.0/3.0;
+  static constexpr double MY_PI  = 3.14159265358979323846; // pi
+  static constexpr double MY_2PI = 6.28318530717958647692; // 2pi
+  static constexpr double MY_3PI = 9.42477796076937971538; // 3pi
+  static constexpr double MY_4PI = 12.56637061435917295384; // 4pi
+  static constexpr double MY_PI2 = 1.57079632679489661923; // pi/2
+  static constexpr double MY_PI4 = 0.78539816339744830962; // pi/4
+  static constexpr double MY_PIS = 1.77245385090551602729; // sqrt(pi)
+  static constexpr double MY_ISPI4 = 1.12837916709551257389; // 1/sqrt(pi/4)
+  static constexpr double MY_SQRT2 = 1.41421356237309504880; // sqrt(2)
+  static constexpr double MY_CBRT2 = 1.25992104989487316476; // 2*(1/3)
 }
 
 }