diff --git a/specification/search/resource-manager/Microsoft.Search/preview/2021-04-01-preview/search.json b/specification/search/resource-manager/Microsoft.Search/preview/2021-04-01-preview/search.json
index cca59a43e2fd..e2a214bf348d 100644
--- a/specification/search/resource-manager/Microsoft.Search/preview/2021-04-01-preview/search.json
+++ b/specification/search/resource-manager/Microsoft.Search/preview/2021-04-01-preview/search.json
@@ -2389,7 +2389,7 @@
     "OperationServiceSpecification": {
       "description": "Specifications of the service for this operation.",
       "properties": {
-        "metricsSpecifications": {
+        "metricSpecifications": {
           "type": "array",
           "readOnly": true,
           "items": {