diff --git a/vlib/v/gen/c/cheaders.v b/vlib/v/gen/c/cheaders.v
index dbf44836a6..a855864287 100644
--- a/vlib/v/gen/c/cheaders.v
+++ b/vlib/v/gen/c/cheaders.v
@@ -61,11 +61,17 @@ const c_common_macros = '
 #define __NOINLINE __attribute__((noinline))
 #define __IRQHANDLER __attribute__((interrupt))
 
+#define __V_architecture 0
 #if defined(__x86_64__)
 #define __V_amd64  1
+#undef __V_architecture
+#define __V_architecture 1
 #endif
+
 #if defined(__aarch64__) || defined(__arm64__)
 #define __V_arm64  1
+#undef __V_architecture
+#define __V_architecture 2
 #endif
 
 // Using just __GNUC__ for detecting gcc, is not reliable because other compilers define it too: