diff --git a/pkg/ruler/evaluator_remote.go b/pkg/ruler/evaluator_remote.go
index 97a0c1ce7f9dd..8cfc63efca912 100644
--- a/pkg/ruler/evaluator_remote.go
+++ b/pkg/ruler/evaluator_remote.go
@@ -230,7 +230,7 @@ func (r *RemoteEvaluator) query(ctx context.Context, orgID, query string, ts tim
 			{Key: textproto.CanonicalMIMEHeaderKey("User-Agent"), Values: []string{userAgent}},
 			{Key: textproto.CanonicalMIMEHeaderKey("Content-Type"), Values: []string{mimeTypeFormPost}},
 			{Key: textproto.CanonicalMIMEHeaderKey("Content-Length"), Values: []string{strconv.Itoa(len(body))}},
-			{Key: textproto.CanonicalMIMEHeaderKey(string(httpreq.QueryTagsHTTPHeader)), Values: []string{"ruler"}},
+			{Key: textproto.CanonicalMIMEHeaderKey(string(httpreq.QueryTagsHTTPHeader)), Values: []string{"source=ruler"}},
 			{Key: textproto.CanonicalMIMEHeaderKey(user.OrgIDHeaderName), Values: []string{orgID}},
 		},
 	}