diff --git a/backend/schema/common.json b/backend/schema/common.json
index 00b06e00..e56c9f70 100644
--- a/backend/schema/common.json
+++ b/backend/schema/common.json
@@ -77,14 +77,12 @@
 			"example": 3
 		},
 		"domain_names": {
-			"description": "Domain Names separated by a comma",
+			"description": "Domain Names array",
 			"type": "array",
-			"minItems": 1,
-			"maxItems": 100,
 			"uniqueItems": true,
 			"items": {
 				"type": "string",
-				"pattern": "^[^&| @!#%^();:/\\\\}{=+?<>,~`'\"]+$"
+				"minLength": 1
 			},
 			"example": ["example.com", "www.example.com"]
 		},
diff --git a/backend/schema/components/certificate-object.json b/backend/schema/components/certificate-object.json
index 80cd92be..4ef666b4 100644
--- a/backend/schema/components/certificate-object.json
+++ b/backend/schema/components/certificate-object.json
@@ -25,15 +25,7 @@
 			"example": "My Custom Cert"
 		},
 		"domain_names": {
-			"description": "Domain Names separated by a comma",
-			"type": "array",
-			"maxItems": 100,
-			"uniqueItems": true,
-			"items": {
-				"type": "string",
-				"pattern": "^[^&| @!#%^();:/\\\\}{=+?<>,~`'\"]+$"
-			},
-			"example": ["example.com", "www.example.com"]
+			"$ref": "../common.json#/properties/domain_names"
 		},
 		"expires_on": {
 			"description": "Date and time of expiration",