diff --git a/sys/conf/options b/sys/conf/options
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -733,6 +733,7 @@
 DEV_PFSYNC		opt_pf.h
 DEV_SPLASH		opt_splash.h
 DEV_VLAN		opt_vlan.h
+DEV_XENTIMER		opt_global.h
 
 # bce driver
 BCE_DEBUG		opt_bce.h
diff --git a/sys/x86/xen/pv.c b/sys/x86/xen/pv.c
--- a/sys/x86/xen/pv.c
+++ b/sys/x86/xen/pv.c
@@ -107,7 +107,9 @@
 /*-------------------------------- Global Data -------------------------------*/
 struct init_ops xen_pvh_init_ops = {
 	.parse_preload_data		= xen_pvh_parse_preload_data,
+#ifdef DEV_XENTIMER
 	.early_clock_source_init	= xen_clock_init,
+#endif
 	.early_delay			= xen_delay,
 	.parse_memmap			= pvh_parse_memmap,
 };