diff --git a/include/asm-x86/nmi.h b/include/asm-x86/nmi.h
index 1e363021e72f..8455bf36d8df 100644
--- a/include/asm-x86/nmi.h
+++ b/include/asm-x86/nmi.h
@@ -46,7 +46,6 @@ extern void nmi_watchdog_default(void);
 
 extern int check_nmi_watchdog(void);
 extern int nmi_watchdog_enabled;
-extern int unknown_nmi_panic;
 extern int avail_to_resrv_perfctr_nmi_bit(unsigned int);
 extern int avail_to_resrv_perfctr_nmi(unsigned int);
 extern int reserve_perfctr_nmi(unsigned int);