diff --git a/schemas/v3.0/schema.yaml b/schemas/v3.0/schema.yaml
index 4fcdd2d37c..0123b9f645 100644
--- a/schemas/v3.0/schema.yaml
+++ b/schemas/v3.0/schema.yaml
@@ -980,6 +980,7 @@ definitions:
         type: string
       operationRef:
         type: string
+        format: uri-reference
       parameters:
         type: object
         additionalProperties: {}
diff --git a/schemas/v3.1/schema.yaml b/schemas/v3.1/schema.yaml
index a852ae14bd..bd1925ca9c 100644
--- a/schemas/v3.1/schema.yaml
+++ b/schemas/v3.1/schema.yaml
@@ -622,6 +622,7 @@ $defs:
     properties:
       operationRef:
         type: string
+        format: uri-reference
       operationId:
         type: string
       parameters: