diff --git a/schemas/rum/resource-schema.json b/schemas/rum/resource-schema.json
index f3a0529b..cade0094 100644
--- a/schemas/rum/resource-schema.json
+++ b/schemas/rum/resource-schema.json
@@ -301,6 +301,9 @@
                 "headers": {
                   "type": "object",
                   "description": "HTTP headers of the resource request",
+                  "propertyNames": {
+                    "pattern": "^[a-z][a-z0-9]*(-[a-z0-9]+)*$"
+                  },
                   "additionalProperties": {
                     "type": "string"
                   },
@@ -316,6 +319,9 @@
                 "headers": {
                   "type": "object",
                   "description": "HTTP headers of the resource response",
+                  "propertyNames": {
+                    "pattern": "^[a-z][a-z0-9]*(-[a-z0-9]+)*$"
+                  },
                   "additionalProperties": {
                     "type": "string"
                   },