diff --git a/src/common/bspf.hxx b/src/common/bspf.hxx
index bdad46e24..7ecd32d78 100644
--- a/src/common/bspf.hxx
+++ b/src/common/bspf.hxx
@@ -58,11 +58,6 @@ using uInt64 = uint64_t;
 #include <utility>
 #include <vector>
 
-// It seems not all C++20 implementations support this yet
-#if __has_include(<numbers>)
-  #include <numbers>
-#endif
-
 using std::cin;
 using std::cout;
 using std::cerr;
@@ -121,21 +116,10 @@ static const string EmptyString("");
 
 namespace BSPF
 {
-#if __has_include(<numbers>)
   static constexpr float PI_f = std::numbers::pi_v<float>;
   static constexpr double PI_d = std::numbers::pi_v<double>;
   static constexpr double ln10 = std::numbers::ln10;
   static constexpr double ln2 = std::numbers::ln2;
-#else
-  [[deprecated("C++20 implementation missing <numbers> support.")]]
-  static constexpr float PI_f = 3.141592653589793238462643383279502884F;
-  [[deprecated("C++20 implementation missing <numbers> support.")]]
-  static constexpr double PI_d = 3.141592653589793238462643383279502884;
-  [[deprecated("C++20 implementation missing <numbers> support.")]]
-  static constexpr double ln10 = 2.302585092994045684017991454684364208;
-  [[deprecated("C++20 implementation missing <numbers> support.")]]
-  static constexpr double ln2 = 0.693147180559945309417232121458176568;
-#endif
 
   // CPU architecture type
   // This isn't complete yet, but takes care of all the major platforms