diff --git a/gnu/packages/mail.scm b/gnu/packages/mail.scm
index 3d5417bfb5..6fa2832b5c 100644
--- a/gnu/packages/mail.scm
+++ b/gnu/packages/mail.scm
@@ -1441,7 +1441,7 @@ hashing schemes plugin for @code{Dovecot}.")
     (inputs
      `(("bdb" ,bdb)
        ("cyrus-sasl" ,cyrus-sasl)
-       ("openssl" ,openssl)
+       ("openssl" ,openssl-1.0)
        ("zlib" ,zlib)))
     (home-page "http://isync.sourceforge.net/")
     (synopsis "Mailbox synchronization program")