diff --git a/lisp/window.el b/lisp/window.el
index 48005fc93e..6c08e71aae 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -5414,6 +5414,12 @@ split-window

 	  ;; Sanitize sizes unless SIZE was specified.
 	  (unless size
+            ;; Make sure the new window gets any `min-margins' parameter
+            ;; of WINDOW.  Otherwise, sanitizing screws up window sizes
+            ;; considerably (Bug#44483).
+            (let ((min-margins (window-parameter window 'min-margins)))
+              (when min-margins
+                (set-window-parameter new 'min-margins min-margins)))
             (window--sanitize-window-sizes horizontal))

 	  (run-window-scroll-functions new)