diff --git a/gnu/packages/video.scm b/gnu/packages/video.scm
index ab1cae803f5d43d84d7f15e3b1ea71f028a9cd02..54fdde0046fd7b29867e9de9ed9fd82468234610 100644
--- a/gnu/packages/video.scm
+++ b/gnu/packages/video.scm
@@ -1170,13 +1170,13 @@ (define-public xvid
     (native-inputs `(("yasm" ,yasm)))
     (arguments
      '(#:phases
-       (alist-cons-before
-        'configure 'pre-configure
-        (lambda _
-          (chdir "build/generic")
-          (substitute* "configure"
-            (("#! /bin/sh") (string-append "#!" (which "sh")))))
-        %standard-phases)
+       (modify-phases %standard-phases
+         (add-before
+          'configure 'pre-configure
+          (lambda _
+            (chdir "build/generic")
+            (substitute* "configure"
+              (("#! /bin/sh") (string-append "#!" (which "sh")))))))
        ;; No 'check' target.
        #:tests? #f))
     (home-page "https://www.xvid.com/")