diff --git a/Dockerfile b/Dockerfile
index 8edfeac..a0b96dd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -71,9 +71,7 @@ RUN apk add --no-cache --virtual .deps gcc python3-dev libc-dev libffi-dev && \
 
 COPY root /
 
-RUN chmod +x /container-init.sh && \
-    chmod +x /certbot-prepare.sh && \
-    chmod +x /check-one-shot.sh && \
+RUN chmod +x /container-init.sh /certbot-prepare.sh /check-one-shot.sh /renew-function.sh && \
     chown -R ${PUID}:${PGID} /app /config
 
 ENTRYPOINT [ "/init" ]
diff --git a/root/certbot-prepare.sh b/root/certbot-prepare.sh
index 2464296..6c4d93f 100644
--- a/root/certbot-prepare.sh
+++ b/root/certbot-prepare.sh
@@ -59,33 +59,7 @@ echo "#!/command/with-contenv bash
 
 date
 echo \"Attempting to renew certificates\"
-function renew() {
-
-    #Variables:
-
-    #\$1 = Certbot command
-
-    RENEWAL_DOMAINS=\$(echo \$1 | sed -r 's/.*\s-d\s(\S*).*/\1/')
-    CUSTOM_CA_PATH=\$(echo \$1 | sed -r 's/REQUESTS_CA_BUNDLE=(\S*)\s(.*)/\1/')
-    CERTBOT_COMMAND=\$(echo \$1 | sed -r 's/REQUESTS_CA_BUNDLE=(\S*)\s(.*)/\2/')
-
-    echo \"Renewing certificate for \${RENEWAL_DOMAINS}\"
-
-    echo \"REQUESTS_CA_BUNDLE=\${CUSTOM_CA_PATH} \${CERTBOT_COMMAND}\" | bash
-
-    if [ \$? = 0 ]; then
-        echo \"Renewal attempt of certificate for \${RENEWAL_DOMAINS} succeeded\"
-        if [ \"\${NOTIFY_ON_SUCCESS}\" = \"true\" ]; then
-            apprise -b \"Renewal of certificate for \${RENEWAL_DOMAINS} succeeded\" \${APPRISE_URL}
-        fi
-    else
-        echo \"Renewal attempt of certificate for \${RENEWAL_DOMAINS} failed\"
-        if [ \"\${NOTIFY_ON_FAILURE}\" = \"true\" ]; then
-            apprise -b \"Renewal of certificate for \${RENEWAL_DOMAINS} failed\" \${APPRISE_URL}
-        fi
-    fi
-
-}
+source /renew-function.sh
 " > /config/.renew-list.sh
 chmod +x /config/.renew-list.sh
 
diff --git a/root/renew-function.sh b/root/renew-function.sh
new file mode 100644
index 0000000..6f342b0
--- /dev/null
+++ b/root/renew-function.sh
@@ -0,0 +1,27 @@
+function renew() {
+
+    #Variables:
+
+    #$1 = Certbot command
+
+    RENEWAL_DOMAINS=$(echo $1 | sed -r 's/.*\s-d\s(\S*).*/\1/')
+    CUSTOM_CA_PATH=$(echo $1 | sed -r 's/REQUESTS_CA_BUNDLE=(\S*)\s(.*)/\1/')
+    CERTBOT_COMMAND=$(echo $1 | sed -r 's/REQUESTS_CA_BUNDLE=(\S*)\s(.*)/\2/')
+
+    echo "Renewing certificate for ${RENEWAL_DOMAINS}"
+
+    echo "REQUESTS_CA_BUNDLE=${CUSTOM_CA_PATH} ${CERTBOT_COMMAND}" | bash
+
+    if [ $? = 0 ]; then
+        echo "Renewal attempt of certificate for ${RENEWAL_DOMAINS} succeeded"
+        if [ "${NOTIFY_ON_SUCCESS}" = "true" ]; then
+            apprise -b "Renewal of certificate for ${RENEWAL_DOMAINS} succeeded" ${APPRISE_URL}
+        fi
+    else
+        echo "Renewal attempt of certificate for ${RENEWAL_DOMAINS} failed"
+        if [ "${NOTIFY_ON_FAILURE}" = "true" ]; then
+            apprise -b "Renewal of certificate for ${RENEWAL_DOMAINS} failed" ${APPRISE_URL}
+        fi
+    fi
+
+}
\ No newline at end of file