diff --git a/certbot/files/hooks/deploy/proftpd.sh b/certbot/files/hooks/deploy/proftpd.sh
index 2a28fb07..1921458c 100755
--- a/certbot/files/hooks/deploy/proftpd.sh
+++ b/certbot/files/hooks/deploy/proftpd.sh
@@ -1,11 +1,5 @@
 #!/bin/sh
 
-readonly PROGNAME=$(basename "$0")
-readonly ARGS=$@
-
-readonly VERBOSE=${VERBOSE:-"0"}
-readonly QUIET=${QUIET:-"0"}
-
 error() {
     >&2 echo "${PROGNAME}: $1"
     exit 1
@@ -15,14 +9,36 @@ debug() {
         >&2 echo "${PROGNAME}: $1"
     fi
 }
-
-if [ -n "$(pidof proftpd)" ]; then
-    if $($(command -v proftpd) -t 2> /dev/null); then
-        debug "ProFTPD detected... reloading"
-        service proftpd reload
+daemon_found_and_running() {
+    test -n "$(pidof proftpd)" && test -n "${proftpd_bin}"
+}
+config_check() {
+    ${proftpd_bin} configtest > /dev/null 2>&1
+}
+letsencrypt_used() {
+    grep -q -r -E "letsencrypt" /etc/proftpd/
+}
+main() {
+    if daemon_found_and_running; then
+        if letsencrypt_used; then
+            if config_check; then
+                debug "ProFTPD detected... reloading"
+                systemctl reload proftpd
+            else
+                error "ProFTPD config is broken, you must fix it !"
+            fi
+        else
+            debug "ProFTPD doesn't use Let's Encrypt certificate. Skip."
+        fi
     else
-        error "ProFTPD config is broken, you must fix it !"
+        debug "ProFTPD is not running or missing. Skip."
     fi
-else
-    debug "ProFTPD is not running. Skip."
-fi
+}
+
+readonly PROGNAME=$(basename "$0")
+readonly VERBOSE=${VERBOSE:-"0"}
+readonly QUIET=${QUIET:-"0"}
+
+readonly proftpd_bin=$(command -v proftpd)
+
+main