diff --git a/mu.arc b/mu.arc
index 239927d8..7a2c4d90 100644
--- a/mu.arc
+++ b/mu.arc
@@ -452,7 +452,7 @@
 (def new-array (type size)
 ;?   (prn "new array: @type @size")
   (ret result Memory-in-use-until
-    (++ Memory-in-use-until (* (sizeof types*.type!elem) size))))
+    (++ Memory-in-use-until (+ 1 (* (sizeof types*.type!elem) size)))))
 
 (def sizeof (type)
   (if (~or types*.type!record types*.type!array)
diff --git a/mu.arc.t b/mu.arc.t
index bc8e4073..7f9e1042 100644
--- a/mu.arc.t
+++ b/mu.arc.t
@@ -802,7 +802,7 @@
   ;? (prn memory*)
   (if (~iso memory*.1 before)
     (prn "F - 'new' on array with literal size returns current high-water mark"))
-  (if (~iso Memory-in-use-until (+ before 5))
+  (if (~iso Memory-in-use-until (+ before 6))
     (prn "F - 'new' on primitive arrays increments high-water mark by their size")))
 
 (reset)
@@ -816,7 +816,7 @@
   ;? (prn memory*)
   (if (~iso memory*.2 before)
     (prn "F - 'new' on array with variable size returns current high-water mark"))
-  (if (~iso Memory-in-use-until (+ before 5))
+  (if (~iso Memory-in-use-until (+ before 6))
     (prn "F - 'new' on primitive arrays increments high-water mark by their (variable) size")))
 
 (reset)