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diff --git a/include/source_location b/include/source_location
index d16e3c4..958c16f 100644
--- a/include/source_location
+++ b/include/source_location
@@ -52,12 +52,23 @@ class source_location {
// in constant evaluation, so we don't want to use `void*` as the argument
// type unless the builtin returned that, anyhow, and the invalid cast is
// unavoidable.
+# if __has_builtin(__builtin_source_location)
using __bsl_ty = decltype(__builtin_source_location());
+# else
+ using __bsl_ty = __impl*;
+# endif
public:
// The defaulted __ptr argument is necessary so that the builtin is evaluated
// in the context of the caller. An explicit value should never be provided.
- static consteval source_location current(__bsl_ty __ptr = __builtin_source_location()) noexcept {
+ static consteval source_location
+ current(__bsl_ty __ptr =
+# if __has_builtin(__builtin_source_location)
+ __builtin_source_location()
+# else
+ nullptr
+# endif
+ ) noexcept {
source_location __sl;
__sl.__ptr_ = static_cast<const __impl*>(__ptr);
return __sl;
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