diff --git a/code/qcommon/q_platform.h b/code/qcommon/q_platform.h
index ed5d9070..b7442051 100644
--- a/code/qcommon/q_platform.h
+++ b/code/qcommon/q_platform.h
@@ -199,6 +199,8 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
 #ifdef __i386__
 #define ARCH_STRING "i386"
+#elif defined __amd64__
+#define ARCH_STRING "x86_64"
 #elif defined __axp__
 #define ARCH_STRING "alpha"
 #endif