diff --git a/gnu/packages/tex.scm b/gnu/packages/tex.scm
index c8a293b4de..6d3ec93a16 100644
--- a/gnu/packages/tex.scm
+++ b/gnu/packages/tex.scm
@@ -558,17 +558,18 @@ documents.")
                        (string-append (getcwd) ":"
                                       mf "/share/texmf-dist/metafont/base")))
              (mkdir "build")
-             (every (lambda (font)
-                      (format #t "building font ~a\n" font)
-                      (zero? (system* "mf" "-progname=mf"
-                                      "-output-directory=build"
-                                      (string-append "\\"
-                                                     "mode:=ljfour; "
-                                                     "mag:=1; "
-                                                     "batchmode; "
-                                                     "input "
-                                                     (basename font ".mf")))))
-                    (find-files "." "cm(.*[0-9]+.*|inch)\\.mf$"))))
+             (for-each (lambda (font)
+                         (format #t "building font ~a\n" font)
+                         (invoke "mf" "-progname=mf"
+                                 "-output-directory=build"
+                                 (string-append "\\"
+                                                "mode:=ljfour; "
+                                                "mag:=1; "
+                                                "batchmode; "
+                                                "input "
+                                                (basename font ".mf"))))
+                       (find-files "." "cm(.*[0-9]+.*|inch)\\.mf$"))
+             #t))
          (replace 'install
            (lambda* (#:key outputs #:allow-other-keys)
              (let* ((out (assoc-ref outputs "out"))