diff --git a/hyper-schema.json b/hyper-schema.json
index 5112eb09..e9f0e8f2 100644
--- a/hyper-schema.json
+++ b/hyper-schema.json
@@ -51,10 +51,7 @@
         "oneOf": { "$ref": "#/$defs/schemaArray" },
         "not": { "$ref": "#" },
         "contains": { "$ref": "#" },
-        "propertyNames": {
-            "type": "object",
-            "additionalProperties": { "$ref": "#" }
-        },
+        "propertyNames": { "$ref": "#" },
         "base": {
             "type": "string",
             "format": "uri-template"
diff --git a/schema.json b/schema.json
index 545dd093..56bfb53d 100644
--- a/schema.json
+++ b/schema.json
@@ -140,10 +140,7 @@
                 ]
             }
         },
-        "propertyNames": {
-            "type": "object",
-            "additionalProperties": { "$ref": "#" }
-        },
+        "propertyNames": { "$ref": "#" },
         "const": true,
         "enum": {
             "type": "array",