diff --git a/utils/Test/testDeproject.cc b/utils/Test/testDeproject.cc
index c9ae00e40..8675b9643 100644
--- a/utils/Test/testDeproject.cc
+++ b/utils/Test/testDeproject.cc
@@ -8,7 +8,7 @@
 #include "cxxopts.H"
 
 namespace {
-  constexpr double pi = std::acos(-1.0);
+  const double pi = std::acos(-1.0);
 }
 
 using namespace Deproject;
diff --git a/utils/Test/testEmpDeproj.cc b/utils/Test/testEmpDeproj.cc
index 1ae2b0158..a502331ba 100644
--- a/utils/Test/testEmpDeproj.cc
+++ b/utils/Test/testEmpDeproj.cc
@@ -25,7 +25,7 @@ int main(int argc, char* argv[])
   int Nr, Ngrid, NumR, Nint;
 
   // Define pi in a portable way instead of relying on non-standard M_PI
-  constexpr double pi = std::acos(-1.0);
+  const double pi = std::acos(-1.0);
 
   // Parse command-line options
   //