diff --git src/drv_proxy_gen.pl src/drv_proxy_gen.pl
index dd1021f..19a69f3 100755
--- src/drv_proxy_gen.pl
+++ src/drv_proxy_gen.pl
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!@PREFIX@/bin/perl
 #
 # SPDX-FileCopyrightText: 2017-2022 Oswald Buddenhagen <ossi@users.sf.net>
 # SPDX-License-Identifier: GPL-2.0-or-later
diff --git src/mbsyncrc.sample src/mbsyncrc.sample
index 7f85527..8d90081 100644
--- src/mbsyncrc.sample
+++ src/mbsyncrc.sample
@@ -87,7 +87,7 @@ IMAPStore st1
 Host st1.domain.com
 AuthMech CRAM-MD5
 # Omit if you want to use the system certificate store.
-CertificateFile ~/.st1-certificate.crt
+CertificateFile @PREFIX@/share/curl/curl-ca-bundle.crt
 
 IMAPStore st2
 Host imap.another-domain.com
@@ -102,7 +102,7 @@ Near :st2:
 IMAPAccount server
 Host imaps:foo.bar.com
 # Omit if you want to use the system certificate store.
-CertificateFile ~/.server-certificate.crt
+CertificateFile @PREFIX@/share/curl/curl-ca-bundle.crt
 
 IMAPStore server
 Account server