diff --git a/gnu/packages/engineering.scm b/gnu/packages/engineering.scm
index bacf1613fe5cdc9c9dc9603d62efbf4973a04407..7e67784f22ce22040f122ed41b90c8c73da172c7 100644
--- a/gnu/packages/engineering.scm
+++ b/gnu/packages/engineering.scm
@@ -1206,7 +1206,7 @@ (define-public libngspice
          (add-after 'unpack 'patch-timestamps
            (lambda _
              (substitute* "configure"
-               (("`date`") "Do 1. Jan 00:00:00 UTC 1970"))
+               (("`date`") "Thu Jan  1 00:00:01 UTC 1970"))
              #t))
          (add-after 'unpack 'delete-program-manuals
            (lambda _