diff --git a/etc/NEWS b/etc/NEWS
index eb65213ac2f..d2565e50e1e 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1588,9 +1588,9 @@ and the result is not truncated in any way.
 It no longer has lower precedence than '+' and '-'.
 
 ---
-*** Calc now marks its windows dedicated.
-The new user option 'calc-make-windows-dedicated' controls this.  It
-is t by default; set to nil to get back the old behavior.
+*** New user option 'calc-make-windows-dedicated'.
+When this user option is non-nil, Calc will mark its windows as
+dedicated.
 
 ** Calendar
 
diff --git a/lisp/calc/calc.el b/lisp/calc/calc.el
index 553bdc9c6ed..e97315165b3 100644
--- a/lisp/calc/calc.el
+++ b/lisp/calc/calc.el
@@ -1423,7 +1423,7 @@ commands given here will actually operate on the *Calculator* stack."
     (require 'calc-ext)
     (calc-set-language calc-language calc-language-option t)))
 
-(defcustom calc-make-windows-dedicated t
+(defcustom calc-make-windows-dedicated nil
   "If non-nil, windows displaying Calc buffers will be marked dedicated.
 See `window-dedicated-p' for what that means."
   :version "28.1"