diff --git a/emacs/notmuch-address.el b/emacs/notmuch-address.el
index b3c56cfa..2eaca795 100644
--- a/emacs/notmuch-address.el
+++ b/emacs/notmuch-address.el
@@ -37,7 +37,11 @@
 
 (defvar notmuch-address-full-harvest-finished nil
   "t indicates that full completion address harvesting has been
-finished")
+finished. Use notmuch-address--harvest-ready to access.")
+
+(defun notmuch-address--harvest-ready ()
+  "Return t if there is a full address hash available."
+  notmuch-address-full-harvest-finished)
 
 (defcustom notmuch-address-command 'internal
   "Determines how address completion candidates are generated.
@@ -170,7 +174,7 @@ elisp-based implementation or older implementation requiring
 external commands."
   (cond
    ((eq notmuch-address-command 'internal)
-    (when (not notmuch-address-full-harvest-finished)
+    (unless (notmuch-address--harvest-ready)
       ;; First, run quick synchronous harvest based on what the user
       ;; entered so far
       (notmuch-address-harvest original t))
diff --git a/emacs/notmuch-company.el b/emacs/notmuch-company.el
index ebe2c084..dca6471b 100644
--- a/emacs/notmuch-company.el
+++ b/emacs/notmuch-company.el
@@ -41,7 +41,7 @@
 (declare-function notmuch-address-harvest "notmuch-address")
 (declare-function notmuch-address-harvest-trigger "notmuch-address")
 (declare-function notmuch-address-matching "notmuch-address")
-(defvar notmuch-address-full-harvest-finished)
+(declare-function notmuch-address--harvest-ready "notmuch-address")
 (defvar notmuch-address-completion-headers-regexp)
 
 ;;;###autoload
@@ -70,7 +70,7 @@
 				 (line-beginning-position))
 		   (setq notmuch-company-last-prefix (company-grab "[:,][ \t]*\\(.*\\)" 1 (point-at-bol)))))
       (candidates (cond
-		   (notmuch-address-full-harvest-finished
+		   ((notmuch-address--harvest-ready)
 		    ;; Update harvested addressed from time to time
 		    (notmuch-address-harvest-trigger)
 		    (notmuch-address-matching arg))