diff --git a/src/system/libroot/posix/rpmalloc/rpmalloc.cpp b/src/system/libroot/posix/rpmalloc/rpmalloc.cpp
index 0b2ffc765d..7e4ae27681 100644
--- a/src/system/libroot/posix/rpmalloc/rpmalloc.cpp
+++ b/src/system/libroot/posix/rpmalloc/rpmalloc.cpp
@@ -142,7 +142,7 @@
 #  endif
 #endif
 
-#if defined( __x86_64__ ) || defined( _M_AMD64 ) || defined( _M_X64 ) || defined( _AMD64_ ) || defined( __arm64__ ) || defined( __aarch64__ )
+#if defined(__LLP64__) || defined(__LP64__)
 #  define ARCH_64BIT 1
 #else
 #  define ARCH_64BIT 0