diff --git a/sys/vm/vm_phys.c b/sys/vm/vm_phys.c
index 4169f25b7e4..5c33be43079 100644
--- a/sys/vm/vm_phys.c
+++ b/sys/vm/vm_phys.c
@@ -263,7 +263,6 @@ sysctl_vm_phys_free(SYSCTL_HANDLER_ARGS)
 			}
 		}
 	}
-	sbuf_putc(&sbuf, 0); /* nullterm */
 	error = sbuf_finish(&sbuf);
 	sbuf_delete(&sbuf);
 	return (error);
@@ -293,7 +292,6 @@ sysctl_vm_phys_segs(SYSCTL_HANDLER_ARGS)
 		sbuf_printf(&sbuf, "domain:    %d\n", seg->domain);
 		sbuf_printf(&sbuf, "free list: %p\n", seg->free_queues);
 	}
-	sbuf_putc(&sbuf, 0); /* nullterm */
 	error = sbuf_finish(&sbuf);
 	sbuf_delete(&sbuf);
 	return (error);
diff --git a/sys/vm/vm_reserv.c b/sys/vm/vm_reserv.c
index 4619a397591..585a7494060 100644
--- a/sys/vm/vm_reserv.c
+++ b/sys/vm/vm_reserv.c
@@ -261,7 +261,6 @@ sysctl_vm_reserv_partpopq(SYSCTL_HANDLER_ARGS)
 		sbuf_printf(&sbuf, "%5d: %6dK, %6d\n", level,
 		    unused_pages * ((int)PAGE_SIZE / 1024), counter);
 	}
-	sbuf_putc(&sbuf, 0); /* nullterm */
 	error = sbuf_finish(&sbuf);
 	sbuf_delete(&sbuf);
 	return (error);