diff --git a/gnu/packages/statistics.scm b/gnu/packages/statistics.scm
index af2ae9ec05..fe352f1b4e 100644
--- a/gnu/packages/statistics.scm
+++ b/gnu/packages/statistics.scm
@@ -6922,34 +6922,33 @@ (define-public emacs-ess
                   (let-syntax
                       ((disable-tests
                         (syntax-rules ()
-                          ((_ file ())
+                          ((_ ())
                            (syntax-error "test names list must not be empty"))
-                          ((_ file (test-name ...))
-                           (substitute* file
+                          ((_ (test-name ...))
+                           (substitute* (find-files "test" "\\.el$")
                              (((string-append "^\\(ert-deftest " test-name ".*")
                                all)
                               (string-append all "(skip-unless nil)\n"))
                              ...))))
                        (disable-etests  ;different test syntax
                         (syntax-rules ()
-                          ((_ file ())
+                          ((_ ())
                            (syntax-error "test names list must not be empty"))
-                          ((_ file (test-name ...))
-                           (emacs-batch-edit-file file
-                             '(progn
-                               (mapc (lambda (test)
-                                       (goto-char (point-min))
-                                       (search-forward
-                                        (format "etest-deftest %s " test))
-                                       (beginning-of-line)
-                                       (kill-sexp))
-                                     (list test-name ...))
-                               (basic-save-buffer)))))))
-                    (disable-tests (list "test/ess-test-inf.el"
-                                         "test/ess-test-r.el")
-                                   ("ess--derive-connection-path"
-                                    ;; Looks like an off-by-one error.
-                                    "ess--command-browser-unscoped-essr"
+                          ((_ (test-name ...))
+                           (for-each
+                            (lambda (file)
+                              (emacs-batch-edit-file file
+                                '(progn
+                                  (dolist (test (list test-name ...))
+                                          (goto-char (point-min))
+                                          (let ((s (format "etest-deftest %s "
+                                                           test)))
+                                            (when (search-forward s nil t)
+                                              (beginning-of-line)
+                                              (kill-sexp))))
+                                  (basic-save-buffer))))
+                            (find-files "test" "\\.el$"))))))
+                    (disable-tests ("ess--derive-connection-path"
                                     "ess-eval-line-test"
                                     "ess-eval-region-test"
                                     "ess-mock-remote-process"
@@ -6957,9 +6956,10 @@ (define-public emacs-ess
                                     "ess-r-load-ESSR-github-fetch-yes"
                                     "ess-set-working-directory-test"
                                     "ess-test-r-startup-directory"))
-                    (disable-etests "test/ess-test-r-eval.el"
-                                    ("ess-r-eval-ns-env-roxy-tracebug-test"
-                                     "ess-r-eval-sink-freeze-test")))))
+                    (disable-etests ("ess-r-eval-ns-env-roxy-tracebug-test"
+                                     "ess-r-eval-sink-freeze-test"
+                                     ;; Looks like an off-by-one error.
+                                     "ess--command-browser-unscoped-essr")))))
               (replace 'check
                 (lambda* (#:key tests? #:allow-other-keys)
                   (when tests? (invoke "make" "test"))))))))