diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
index cdca6e4200c..baa71b2860f 100644
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -509,6 +509,7 @@ pmap_init2()
 
 	TUNABLE_INT_FETCH("vm.pmap.shpgperproc", &shpgperproc);
 	pv_entry_max = shpgperproc * maxproc + vm_page_array_size;
+	TUNABLE_INT_FETCH("vm.pmap.pv_entries", &pv_entry_max);
 	pv_entry_high_water = 9 * (pv_entry_max / 10);
 	zinitna(pvzone, &pvzone_obj, NULL, 0, pv_entry_max, ZONE_INTERRUPT, 1);
 }
diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c
index cdca6e4200c..baa71b2860f 100644
--- a/sys/i386/i386/pmap.c
+++ b/sys/i386/i386/pmap.c
@@ -509,6 +509,7 @@ pmap_init2()
 
 	TUNABLE_INT_FETCH("vm.pmap.shpgperproc", &shpgperproc);
 	pv_entry_max = shpgperproc * maxproc + vm_page_array_size;
+	TUNABLE_INT_FETCH("vm.pmap.pv_entries", &pv_entry_max);
 	pv_entry_high_water = 9 * (pv_entry_max / 10);
 	zinitna(pvzone, &pvzone_obj, NULL, 0, pv_entry_max, ZONE_INTERRUPT, 1);
 }