diff --git a/docs/swagger/definitions/NotFoundRedirects.json b/docs/swagger/definitions/NotFoundRedirects.json
index 6887ed0c..d0459f90 100644
--- a/docs/swagger/definitions/NotFoundRedirects.json
+++ b/docs/swagger/definitions/NotFoundRedirects.json
@@ -2,18 +2,15 @@
     "type": "object",
     "properties": {
         "baseUrlRedirect": {
-            "type": "string",
-            "nullable": true,
+            "type": ["string", "null"],
             "description": "URL to redirect to when a user hits the domain's base URL"
         },
         "regular404Redirect": {
-            "type": "string",
-            "nullable": true,
+            "type": ["string", "null"],
             "description": "URL to redirect to when a user hits a not found URL other than an invalid short URL"
         },
         "invalidShortUrlRedirect": {
-            "type": "string",
-            "nullable": true,
+            "type": ["string", "null"],
             "description": "URL to redirect to when a user hits an invalid short URL"
         }
     }
diff --git a/docs/swagger/definitions/OrphanVisit.json b/docs/swagger/definitions/OrphanVisit.json
index 04d8386d..a8b4954a 100644
--- a/docs/swagger/definitions/OrphanVisit.json
+++ b/docs/swagger/definitions/OrphanVisit.json
@@ -6,8 +6,7 @@
     }],
     "properties": {
         "visitedUrl": {
-            "type": "string",
-            "nullable": true,
+            "type": ["string", "null"],
             "description": "The originally visited URL that triggered the tracking of this visit"
         },
         "type": {
diff --git a/docs/swagger/definitions/ShortUrl.json b/docs/swagger/definitions/ShortUrl.json
index 4060e2f2..98fd9c87 100644
--- a/docs/swagger/definitions/ShortUrl.json
+++ b/docs/swagger/definitions/ShortUrl.json
@@ -55,13 +55,11 @@
             "$ref": "./ShortUrlMeta.json"
         },
         "domain": {
-            "type": "string",
-            "nullable": true,
+            "type": ["string", "null"],
             "description": "The domain in which the short URL was created. Null if it belongs to default domain."
         },
         "title": {
-            "type": "string",
-            "nullable": true,
+            "type": ["string", "null"],
             "description": "A descriptive title of the short URL."
         },
         "crawlable": {
diff --git a/docs/swagger/definitions/ShortUrlEdition.json b/docs/swagger/definitions/ShortUrlEdition.json
index ed3c3929..dda213ca 100644
--- a/docs/swagger/definitions/ShortUrlEdition.json
+++ b/docs/swagger/definitions/ShortUrlEdition.json
@@ -10,18 +10,15 @@
         },
         "validSince": {
             "description": "The date (in ISO-8601 format) from which this short code will be valid",
-            "type": "string",
-            "nullable": true
+            "type": ["string", "null"]
         },
         "validUntil": {
             "description": "The date (in ISO-8601 format) until which this short code will be valid",
-            "type": "string",
-            "nullable": true
+            "type": ["string", "null"]
         },
         "maxVisits": {
             "description": "The maximum number of allowed visits for this short code",
-            "type": "number",
-            "nullable": true
+            "type": ["number", "null"]
         },
         "validateUrl": {
             "deprecated": true,
@@ -36,9 +33,8 @@
             "description": "The list of tags to set to the short URL."
         },
         "title": {
-            "type": "string",
-            "description": "A descriptive title of the short URL.",
-            "nullable": true
+            "type": ["string", "null"],
+            "description": "A descriptive title of the short URL."
         },
         "crawlable": {
             "type": "boolean",
diff --git a/docs/swagger/definitions/ShortUrlMeta.json b/docs/swagger/definitions/ShortUrlMeta.json
index 370a548b..d687d97f 100644
--- a/docs/swagger/definitions/ShortUrlMeta.json
+++ b/docs/swagger/definitions/ShortUrlMeta.json
@@ -4,18 +4,15 @@
     "properties": {
         "validSince": {
             "description": "The date (in ISO-8601 format) from which this short code will be valid",
-            "type": "string",
-            "nullable": true
+            "type": ["string", "null"]
         },
         "validUntil": {
             "description": "The date (in ISO-8601 format) until which this short code will be valid",
-            "type": "string",
-            "nullable": true
+            "type": ["string", "null"]
         },
         "maxVisits": {
             "description": "The maximum number of allowed visits for this short code",
-            "type": "number",
-            "nullable": true
+            "type": ["number", "null"]
         }
     }
 }