diff --git a/lisp/calc/calc-help.el b/lisp/calc/calc-help.el
index 5357ca17f56..7b9ac5cd1fd 100644
--- a/lisp/calc/calc-help.el
+++ b/lisp/calc/calc-help.el
@@ -366,20 +366,20 @@ C-w  Describe how there is no warranty for Calc."
     (let (Info-history)
       (Info-goto-node (buffer-substring (match-beginning 1) (match-end 1))))
     (or (let ((case-fold-search nil))
-	  (or (search-forward (format "\\[`%s'\\]\\|(`%s')\\|\\<The[ \n]`%s'"
-				      (or target thing)
-				      (or target thing)
-				      (or target thing)) nil t)
+	  (or (re-search-forward (format "\\[`%s'\\]\\|(`%s')\\|\\<The[ \n]`%s'"
+                                         (or target thing)
+                                         (or target thing)
+                                         (or target thing)) nil t)
 	      (and not-quoted
 		   (let ((case-fold-search t))
 		     (search-forward (or target thing) nil t)))
 	      (search-forward (format "`%s'" (or target thing)) nil t)
 	      (search-forward (or target thing) nil t)))
 	(let ((case-fold-search t))
-	  (or (search-forward (format "\\[`%s'\\]\\|(`%s')\\|\\<The[ \n]`%s'"
-				      (or target thing)
-				      (or target thing)
-				      (or target thing)) nil t)
+	  (or (re-search-forward (format "\\[`%s'\\]\\|(`%s')\\|\\<The[ \n]`%s'"
+                                         (or target thing)
+                                         (or target thing)
+                                         (or target thing)) nil t)
 	      (search-forward (format "`%s'" (or target thing)) nil t)
 	      (search-forward (or target thing) nil t))))
     (beginning-of-line)