diff --git a/conanfile.py b/conanfile.py
index 1e414481ec53edfc01c4894b5902ea3665694140..d0924b1d33bdcb48ddb37e22b0de3f3a5c3815fb 100644
--- a/conanfile.py
+++ b/conanfile.py
@@ -1,3 +1,5 @@
+import sys
+
 from conans import ConanFile, Meson, tools
 
 
@@ -22,7 +24,8 @@ class CsgEbConan(ConanFile):
 
     def build(self):
         meson = Meson(self)
-        meson.configure(build_folder="build")
+        args = ["-Dcpp_std=vc++latest"] if sys.platform in ("win32", "cygwin") else []
+        meson.configure(build_folder="build", args=args)
         meson.build()
         meson.meson_test(args=["--verbose", "--print-errorlog"])
 
diff --git a/src/csg/levelset_3d.cpp b/src/csg/levelset_3d.cpp
index 50bad9003eb9d52afbd3ca8bdce3d29ff35f203f..1f3756c7f26710bd64f0b1dba1ce2a9d6834f3e1 100644
--- a/src/csg/levelset_3d.cpp
+++ b/src/csg/levelset_3d.cpp
@@ -2,10 +2,11 @@
 #include "csg_types.hpp"
 
 #include <algorithm>
-#include <cmath>
 #include <iostream>
 #include <limits>
 
+const double DEGREES_PER_RADIAN = 45 / std::atan(1);
+
 namespace {
 
 template <class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
@@ -145,7 +146,7 @@ double signed_distance_3d(const LinearExtrude &lin_ext, double xx, double yy,
 
 double signed_distance_3d(const RotateExtrude &rot_ext, double xx, double yy,
                           double zz) {
-  double tt = atan(yy / xx) * 180 / M_PI;
+  double tt = atan(yy / xx) * DEGREES_PER_RADIAN;
   if ((xx < 0 && yy >= 0) || (xx < 0 && yy < 0))
     tt += 180; // Quadrants II & III
   else if (xx >= 0 && yy < 0)
diff --git a/src/csg/tests/meson.build b/src/csg/tests/meson.build
index b2897a64d00c878b6e155d5482c01b630817b804..b08f621a5909e55d0d5e1a428d74c49107c8ee65 100644
--- a/src/csg/tests/meson.build
+++ b/src/csg/tests/meson.build
@@ -14,7 +14,6 @@ test_csg = executable('unit_tests_csg',
   include_directories: [parser_inc],
   dependencies: [catch2, cgal],
   link_with: lib_csg_parser,
-  override_options: 'cpp_std=c++2a',
 )
 
 test('unit_test_csg', test_csg)