diff --git a/src/Mod/CAM/PathSimulator/AppGL/MillPathSegment.cpp b/src/Mod/CAM/PathSimulator/AppGL/MillPathSegment.cpp
index 53bef6acfd..fa2b5b2274 100644
--- a/src/Mod/CAM/PathSimulator/AppGL/MillPathSegment.cpp
+++ b/src/Mod/CAM/PathSimulator/AppGL/MillPathSegment.cpp
@@ -27,7 +27,7 @@
 #include "GlUtils.h"
 #include <iostream>
 
-using std::numbers::pi;
+constexpr auto pi = std::numbers::pi_v<float>;
 
 #define N_MILL_SLICES 8
 #define MAX_SEG_DEG (pi / 2.0f)   // 90 deg
diff --git a/src/Mod/CAM/PathSimulator/AppGL/SimDisplay.cpp b/src/Mod/CAM/PathSimulator/AppGL/SimDisplay.cpp
index 88f10bb4bc..1c09c9420b 100644
--- a/src/Mod/CAM/PathSimulator/AppGL/SimDisplay.cpp
+++ b/src/Mod/CAM/PathSimulator/AppGL/SimDisplay.cpp
@@ -36,8 +36,6 @@
 namespace MillSim
 {
 
-using std::numbers::pi;
-
 void SimDisplay::InitShaders()
 {
     // use shaders
diff --git a/src/Mod/CAM/PathSimulator/AppGL/SimDisplay.h b/src/Mod/CAM/PathSimulator/AppGL/SimDisplay.h
index 04ff704bc2..55f2d8eb8b 100644
--- a/src/Mod/CAM/PathSimulator/AppGL/SimDisplay.h
+++ b/src/Mod/CAM/PathSimulator/AppGL/SimDisplay.h
@@ -34,7 +34,7 @@
 namespace MillSim
 {
 
-using std::numbers::pi;
+constexpr auto pi = std::numbers::pi_v<float>;
 
 struct Point3D
 {