diff --git a/sys/kern/kern_mib.c b/sys/kern/kern_mib.c
--- a/sys/kern/kern_mib.c
+++ b/sys/kern/kern_mib.c
@@ -199,7 +199,12 @@
 {
 	u_long val, p;
 
-	p = SIZE_T_MAX >> PAGE_SHIFT;
+#ifdef SCTL_MASK32
+	if ((req->flags & SCTL_MASK32) != 0)
+		p = UINT32_MAX >> PAGE_SHIFT;
+	else
+#endif
+		p = SIZE_T_MAX >> PAGE_SHIFT;
 	if (physmem < p)
 		p = physmem;
 	val = ctob(p);
@@ -215,7 +220,12 @@
 {
 	u_long val, p;
 
-	p = SIZE_T_MAX >> PAGE_SHIFT;
+#ifdef SCTL_MASK32
+	if ((req->flags & SCTL_MASK32) != 0)
+		p = UINT32_MAX >> PAGE_SHIFT;
+	else
+#endif
+		p = SIZE_T_MAX >> PAGE_SHIFT;
 	if (realmem < p)
 		p = realmem;
 	val = ctob(p);
@@ -232,7 +242,12 @@
 	u_long val, p, p1;
 
 	p1 = physmem - vm_wire_count();
-	p = SIZE_T_MAX >> PAGE_SHIFT;
+#ifdef SCTL_MASK32
+	if ((req->flags & SCTL_MASK32) != 0)
+		p = UINT32_MAX >> PAGE_SHIFT;
+	else
+#endif
+		p = SIZE_T_MAX >> PAGE_SHIFT;
 	if (p1 < p)
 		p = p1;
 	val = ctob(p);