diff --git a/src/utils/program_name.hpp b/src/utils/program_name.hpp
index 1437a5b..19bcc37 100644
--- a/src/utils/program_name.hpp
+++ b/src/utils/program_name.hpp
@@ -49,8 +49,8 @@ namespace detail {
         static bool valid = false;
         if(!did_init) {
             did_init = true;
-            constexpr std::uint32_t bufferSize = CPPTRACE_PATH_MAX + 1;
-            char buffer[bufferSize];
+            char buffer[CPPTRACE_PATH_MAX + 1];
+            std::uint32_t bufferSize = sizeof buffer;
             if(_NSGetExecutablePath(buffer, &bufferSize) == 0) {
                 name.assign(buffer, bufferSize);
                 valid = true;