diff --git a/sys/x86/xen/pv.c b/sys/x86/xen/pv.c
index 50d2e76187c..58eb7363f9b 100644
--- a/sys/x86/xen/pv.c
+++ b/sys/x86/xen/pv.c
@@ -96,13 +96,8 @@ static int xen_pv_start_all_aps(void);
 /*---------------------------- Extern Declarations ---------------------------*/
 #ifdef SMP
 /* Variables used by amd64 mp_machdep to start APs */
-extern struct mtx ap_boot_mtx;
-extern void *bootstacks[];
 extern char *doublefault_stack;
 extern char *nmi_stack;
-extern void *dpcpu;
-extern int bootAP;
-extern char *bootSTK;
 #endif
 
 /*
diff --git a/sys/x86/xen/xen_apic.c b/sys/x86/xen/xen_apic.c
index a65f3b5efb9..9400378d1b3 100644
--- a/sys/x86/xen/xen_apic.c
+++ b/sys/x86/xen/xen_apic.c
@@ -74,12 +74,6 @@ static driver_filter_t xen_cpususpend_handler;
 static driver_filter_t xen_cpustophard_handler;
 #endif
 
-/*---------------------------- Extern Declarations ---------------------------*/
-/* Variables used by mp_machdep to perform the MMU related IPIs */
-#ifdef __amd64__
-extern int pmap_pcid_enabled;
-#endif
-
 /*---------------------------------- Macros ----------------------------------*/
 #define	IPI_TO_IDX(ipi) ((ipi) - APIC_IPI_INTS)