diff --git a/sortix/include/sortix/bits.h b/sortix/include/sortix/bits.h
index 7a5a2e55..d54178d7 100644
--- a/sortix/include/sortix/bits.h
+++ b/sortix/include/sortix/bits.h
@@ -22,11 +22,19 @@
 
 ******************************************************************************/
 
-#ifdef PLATFORM_X86
+#if !defined(PLATFORM_X86) && !defined(PLATFORM_X64)
+	#if defined(__LP64__)
+		#define PLATFORM_X64
+	#else
+		#define PLATFORM_X86
+	#endif
+#endif
+
+#if defined(PLATFORM_X86)
 #include "x86/bits.h"
-#endif
-
-#ifdef PLATFORM_X64
+#elif defined(PLATFORM_X64)
 #include "x64/bits.h"
+#else
+#warning Unsupported platform
 #endif