diff --git a/config.h b/config.h
index a5c0c09b..73af8e27 100644
--- a/config.h
+++ b/config.h
@@ -217,6 +217,9 @@ typedef unsigned int word32;
 #if defined(_MSC_VER) || defined(__BORLANDC__)
 	typedef unsigned __int64 word64;
 	#define W64LIT(x) x##ui64
+#elif ((__arm64__ || __aarch64__) && (_LP64 || __LP64__))
+	typedef unsigned long word64;
+	#define W64LIT(x) x##UL
 #else
 	typedef unsigned long long word64;
 	#define W64LIT(x) x##ULL
diff --git a/config.recommend b/config.recommend
index 587ff044..19c32822 100644
--- a/config.recommend
+++ b/config.recommend
@@ -217,6 +217,9 @@ typedef unsigned int word32;
 #if defined(_MSC_VER) || defined(__BORLANDC__)
 	typedef unsigned __int64 word64;
 	#define W64LIT(x) x##ui64
+#elif ((__arm64__ || __aarch64__) && (_LP64 || __LP64__))
+	typedef unsigned long word64;
+	#define W64LIT(x) x##UL
 #else
 	typedef unsigned long long word64;
 	#define W64LIT(x) x##ULL