diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
index 95e5bc204a1..f12cb0b86b7 100644
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -665,7 +665,7 @@ pmap_extract(pmap, va)
 	vm_offset_t pdirindex;
 
 	if (pmap == 0)
-		return;
+		return 0;
 	pdirindex = va >> PDRSHIFT;
 	rtval = pmap->pm_pdir[pdirindex];
 	if (rtval != 0) {
diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c
index 95e5bc204a1..f12cb0b86b7 100644
--- a/sys/i386/i386/pmap.c
+++ b/sys/i386/i386/pmap.c
@@ -665,7 +665,7 @@ pmap_extract(pmap, va)
 	vm_offset_t pdirindex;
 
 	if (pmap == 0)
-		return;
+		return 0;
 	pdirindex = va >> PDRSHIFT;
 	rtval = pmap->pm_pdir[pdirindex];
 	if (rtval != 0) {