diff --git a/lisp/org-pcomplete.el b/lisp/org-pcomplete.el
index 552a91215..5638414b0 100644
--- a/lisp/org-pcomplete.el
+++ b/lisp/org-pcomplete.el
@@ -155,8 +155,8 @@ When completing for #+STARTUP, for example, this function returns
 	    (let (block-names)
 	      (mapc (lambda (block-name)
 		      (let ((name (car block-name)))
-			(push (format "END_%s: " name) block-names)
-			(push (format "BEGIN_%s: " name) block-names)
+			(push (format "END_%s " name) block-names)
+			(push (format "BEGIN_%s " name) block-names)
 			(push (format "ATTR_%s: " name) block-names)))
 		    org-element-block-name-alist)
 	      block-names)