diff --git a/gnu/packages/mail.scm b/gnu/packages/mail.scm
index dca4ffb9a..3dab1325e 100644
--- a/gnu/packages/mail.scm
+++ b/gnu/packages/mail.scm
@@ -620,11 +620,12 @@ security functionality including PGP, S/MIME, SSH, and SSL.")
              #t))
          (add-after 'patch-configure 'fix-date-tests
            ;; Loosen test tolerances to prevent failures caused by daylight
-           ;; time saving (DST).  See: https://github.com/djcb/mu/issues/1214.
+           ;; saving time (DST).  See: https://github.com/djcb/mu/issues/1214.
            (lambda _
              (substitute* "lib/parser/test-utils.cc"
                (("\\* 60 \\* 60, 1 },")
-                "* 60 * 60, 3600 + 1 },"))))
+                "* 60 * 60, 3600 + 1 },"))
+             #t))
          (add-before 'install 'fix-ffi
            (lambda* (#:key outputs #:allow-other-keys)
              (substitute* "guile/mu.scm"