diff --git a/NA_PROD/slo/Perseus_Reliability_of_key_requests.tf b/NA_PROD/slo/Perseus_Reliability_of_key_requests.tf
index ad765f5..9fc95f4 100644
--- a/NA_PROD/slo/Perseus_Reliability_of_key_requests.tf
+++ b/NA_PROD/slo/Perseus_Reliability_of_key_requests.tf
@@ -17,7 +17,7 @@ module Perseus__-_Reliability_of_key_requests {
     #metric expression of the calculation as done in data explorer ui
    metric_expression           = <<-EOT
 (100)*
-((1)-(builtin:service.keyRequest.errors.server.successCount:filter(
+((builtin:service.keyRequest.errors.server.successCount:filter(
 	and(
 		or(
 			in(