diff --git a/vlib/v/gen/cgen.v b/vlib/v/gen/cgen.v
index f3b59fe7ae..647b35b16d 100644
--- a/vlib/v/gen/cgen.v
+++ b/vlib/v/gen/cgen.v
@@ -4355,12 +4355,21 @@ fn (mut g Gen) comp_if_to_ifdef(name string, is_comptime_optional bool) string {
 		'no_bounds_checking' {
 			return 'CUSTOM_DEFINE_no_bounds_checking'
 		}
+		// architectures:
+		'amd64' {
+			return '__V_amd64'
+		}
+		'aarch64' {
+			return '__V_aarch64'
+		}
+		// bitness:
 		'x64' {
 			return 'TARGET_IS_64BIT'
 		}
 		'x32' {
 			return 'TARGET_IS_32BIT'
 		}
+		// endianness:
 		'little_endian' {
 			return 'TARGET_ORDER_IS_LITTLE'
 		}
diff --git a/vlib/v/gen/cheaders.v b/vlib/v/gen/cheaders.v
index 2fc0735947..ec31f8433b 100644
--- a/vlib/v/gen/cheaders.v
+++ b/vlib/v/gen/cheaders.v
@@ -28,6 +28,13 @@ const (
 #define __NOINLINE __attribute__((noinline))
 #define __IRQHANDLER __attribute__((interrupt))
 
+#if defined(__x86_64__) 
+#define __V_amd64  1
+#endif
+#if defined(__aarch64__) || defined(__arm64__)
+#define __V_aarch64  1
+#endif
+
 // Using just __GNUC__ for detecting gcc, is not reliable because other compilers define it too:
 #ifdef __GNUC__
 	#define __V_GCC__