diff --git a/src/services/updateDesignSet.js b/src/services/updateDesignSet.js
index c97bc18a8..0ad081394 100644
--- a/src/services/updateDesignSet.js
+++ b/src/services/updateDesignSet.js
@@ -48,6 +48,24 @@ const setLabelAsSingleValue = () => {
 	return false
 }
 
+/**
+ * Prevents ical.js from adding 'VALUE=PHONE-NUMBER' in vCard 3.0.
+ * While not wrong according to the RFC, there's a bug in sabreio/vobject (used
+ * by Nextcloud Server) that prevents saving vCards with this parameters.
+ *
+ * @link https://github.com/nextcloud/contacts/pull/1393#issuecomment-570945735
+ *
+ * @returns {Boolean} Whether or not the design set has been altered.
+ */
+const removePhoneNumberValueType = () => {
+	if (ICAL.design.vcard3.property.tel) {
+		delete ICAL.design.vcard3.property.tel
+		return true
+	}
+
+	return false
+}
+
 /**
  * Some clients group properties by naming them something like 'ITEM1.URL'.
  * These should be treated the same as their original (i.e. 'URL' in this
@@ -82,6 +100,7 @@ export default function(vCard) {
 	let madeChanges = false
 
 	madeChanges |= setLabelAsSingleValue()
+	madeChanges |= removePhoneNumberValueType()
 	madeChanges |= addGroupedProperties(vCard)
 
 	return madeChanges