diff --git a/libc/src/__support/macros/properties/architectures.h b/libc/src/__support/macros/properties/architectures.h
--- a/libc/src/__support/macros/properties/architectures.h
+++ b/libc/src/__support/macros/properties/architectures.h
@@ -38,7 +38,10 @@
 #endif
 
 #if (defined(__arm__) || defined(_M_ARM))
-#define LIBC_TARGET_ARCH_IS_ARM
+#define LIBC_TARGET_ARCH_IS_ARM LIBC_TARGET_ARCH_IS_ARM
+inline constexpr bool LIBC_TARGET_ARCH_IS_ARM = true;
+#else
+inline constexpr bool LIBC_TARGET_ARCH_IS_ARM = false;
 #endif
 
 #if defined(__aarch64__) || defined(__arm64__) || defined(_M_ARM64)