diff --git a/definitions/event.json b/definitions/event.json
index e081411..c6fffda 100644
--- a/definitions/event.json
+++ b/definitions/event.json
@@ -158,7 +158,7 @@
         },
         "reservationFor_location_address_postalCode": {
             "title": "Zip Code",
-            "type": "number",
+            "type": "text",
             "required": true,
             "group": 1,
             "short": true
diff --git a/definitions/rentalcar.json b/definitions/rentalcar.json
index 4a232c7..6d3e5b7 100644
--- a/definitions/rentalcar.json
+++ b/definitions/rentalcar.json
@@ -61,7 +61,7 @@
         },
         "dropoffLocation_address_postalCode": {
             "title": "Zip Code",
-            "type": "number",
+            "type": "text",
             "required": true,
             "group": "do",
             "short": true
@@ -124,7 +124,7 @@
         },
         "pickupLocation_address_postalCode": {
             "title": "Zip Code",
-            "type": "number",
+            "type": "text",
             "required": true,
             "group": "pu",
             "short": true
diff --git a/definitions/restaurant.json b/definitions/restaurant.json
index 3019c8f..f46c5fa 100644
--- a/definitions/restaurant.json
+++ b/definitions/restaurant.json
@@ -86,7 +86,7 @@
         },
         "reservationFor_address_postalCode": {
             "title": "Zip Code",
-            "type": "number",
+            "type": "text",
             "required": true,
             "group": 0,
             "short": true