diff --git src/drv_proxy_gen.pl src/drv_proxy_gen.pl
index c7119a6..9abf64e 100755
--- src/drv_proxy_gen.pl
+++ src/drv_proxy_gen.pl
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!@PREFIX@/bin/perl
 #
 # mbsync - mailbox synchronizer
 # Copyright (C) 2017 Oswald Buddenhagen <ossi@users.sf.net>
diff --git src/mbsyncrc.sample src/mbsyncrc.sample
index ef842fe..ecd4bf5 100644
--- src/mbsyncrc.sample
+++ src/mbsyncrc.sample
@@ -61,7 +61,7 @@ Channels work personal remote
 IMAPStore st1
 Host st1.domain.com
 RequireCRAM yes
-CertificateFile ~/.st1-certificate.crt
+CertificateFile @PREFIX@/share/curl/curl-ca-bundle.crt
 
 IMAPStore st2
 Host imap.another-domain.com
@@ -76,7 +76,7 @@ Slave :st2:
 
 IMAPAccount server
 Host imaps:foo.bar.com
-CertificateFile ~/.server-certificate.crt
+CertificateFile @PREFIX@/share/curl/curl-ca-bundle.crt
 
 IMAPStore server
 Account server