diff --git a/gnu/packages/fontutils.scm b/gnu/packages/fontutils.scm
index 34f391e5fa..ff10a4ac73 100644
--- a/gnu/packages/fontutils.scm
+++ b/gnu/packages/fontutils.scm
@@ -351,14 +351,20 @@ definitions.")
                      "0gfcm8yn1d30giqhdwbchnfnspcqypqdzrxlhqhwy1i18wgl0v2v"))
             (modules '((guix build utils)))
             (snippet
-             ;; Make builds bit-reproducible by using fixed date strings.
-             '(substitute* "configure"
-                (("^FONTFORGE_MODTIME=.*$")
-                 "FONTFORGE_MODTIME=\"1458399002\"\n")
-                (("^FONTFORGE_MODTIME_STR=.*$")
-                 "FONTFORGE_MODTIME_STR=\"15:50 CET 19-Mar-2016\"\n")
-                (("^FONTFORGE_VERSIONDATE=.*$")
-                 "FONTFORGE_VERSIONDATE=\"20160319\"\n")))))
+             '(begin
+               ;; Make builds bit-reproducible by using fixed date strings.
+               (substitute* "configure"
+                 (("^FONTFORGE_MODTIME=.*$")
+                  "FONTFORGE_MODTIME=\"1458399002\"\n")
+                 (("^FONTFORGE_MODTIME_STR=.*$")
+                  "FONTFORGE_MODTIME_STR=\"15:50 CET 19-Mar-2016\"\n")
+                 (("^FONTFORGE_VERSIONDATE=.*$")
+                  "FONTFORGE_VERSIONDATE=\"20160319\"\n"))
+
+               ;; Make TTF builds bit-reproducible by clearing the timestamp
+               ;; that goes in TTF files.
+               (substitute* "fontforge/tottf.c"
+                 (("cvt_unix_to_1904\\(now") "cvt_unix_to_1904(0"))))))
    (build-system gnu-build-system)
    (native-inputs
     `(("pkg-config" ,pkg-config)))