diff --git a/headers/os/kernel/OS.h b/headers/os/kernel/OS.h
index 5adb85ce66..60e2715453 100644
--- a/headers/os/kernel/OS.h
+++ b/headers/os/kernel/OS.h
@@ -523,8 +523,6 @@ extern status_t		get_cpu_info(uint32 firstCPU, uint32 cpuCount,
 extern status_t		get_cpu_topology_info(cpu_topology_node_info* topologyInfos,
 						uint32* topologyInfoCount);
 
-#define B_CPU_x86_VENDOR_MASK	0xff00
-
 #if defined(__INTEL__) || defined(__x86_64__)
 typedef union {
 	struct {