blob: d911ce3f9fa55330531941eb8719f0083ca74188 (
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--- include/frozen/bits/defines.h
+++ include/frozen/bits/defines.h
@@ -59,7 +59,7 @@
#define FROZEN_LETITGO_HAS_DEDUCTION_GUIDES
#endif
-#if __cpp_lib_constexpr_string >= 201907L
+#if defined(__cpp_lib_constexpr_string) && __cpp_lib_constexpr_string >= 201907L
#define FROZEN_LETITGO_HAS_CONSTEXPR_STRING
#endif
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